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计算.(能用简便方法计算的要用简便方法计算.)12×(23-14)(57+78)×7×858×710−310×585354×553.8×14+7.2÷4-0.2549×[60%-(716-14)].
题目详情
计算.(能用简便方法计算的要用简便方法计算.)
12×(
-
) (
+
)×7×8
×
−
×
12×(
-
)
-
)
2 2 3 3
)
1 1 4 4 (
+
)×7×8
+
)×7×8
5 5 7 7
7 7 8 8
×
−
×
×
−
×
5 5 8 8
−
×
7 7 10 10
3 3 10 10
5 5 8 8
×55 3.8×
+7.2÷4-0.25
×[60%-(
-
)].
×55
×55
53 53 54 54 3.8×
+7.2÷4-0.25
+7.2÷4-0.25
1 1 4 4
×[60%-(
-
)].
×[60%-(
-
)].
4 4 9 9
-
)].
7 7 16 16
)].
1 1 4 4
12×(
| (
|
| ||||||||||||||||
| 3.8×
|
|
12×(
| (
|
| ||||||||||||||||
| 3.8×
|
|
2 |
3 |
1 |
4 |
5 |
7 |
7 |
8 |
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
2 |
3 |
1 |
4 |
2 |
3 |
1 |
4 |
2 |
3 |
1 |
4 |
1 |
4 |
5 |
7 |
7 |
8 |
5 |
7 |
7 |
8 |
5 |
7 |
7 |
8 |
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
5 |
8 |
53 |
54 |
1 |
4 |
4 |
9 |
7 |
16 |
1 |
4 |
53 |
54 |
53 |
54 |
53 |
54 |
1 |
4 |
1 |
4 |
1 |
4 |
4 |
9 |
7 |
16 |
1 |
4 |
4 |
9 |
7 |
16 |
1 |
4 |
4 |
9 |
7 |
16 |
1 |
4 |
7 |
16 |
1 |
4 |
1 |
4 |
▼优质解答
答案和解析
(1)12×(
-
),
=12×
-12×
,
=8-3,
=5;
(2)(
+
)×7×8,
=(
+
)×(7×8),
=(
×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
2 2 23 3 3-
),
=12×
-12×
,
=8-3,
=5;
(2)(
+
)×7×8,
=(
+
)×(7×8),
=(
×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
1 1 14 4 4),
=12×
-12×
,
=8-3,
=5;
(2)(
+
)×7×8,
=(
+
)×(7×8),
=(
×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
2 2 23 3 3-12×
,
=8-3,
=5;
(2)(
+
)×7×8,
=(
+
)×(7×8),
=(
×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
1 1 14 4 4,
=8-3,
=5;
(2)(
+
)×7×8,
=(
+
)×(7×8),
=(
×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
5 5 57 7 7+
)×7×8,
=(
+
)×(7×8),
=(
×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
7 7 78 8 8)×7×8,
=(
+
)×(7×8),
=(
×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
5 5 57 7 7+
)×(7×8),
=(
×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
7 7 78 8 8)×(7×8),
=(
×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
5 5 57 7 7×7×8)+(
×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
7 7 78 8 8×8×7),
=(5×8)+(7×7),
=40+49,
=89;
(3)
×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
5 5 58 8 8×
−
×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
7 7 710 10 10−
3 3 310 10 10×
,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
5 5 58 8 8,
=
×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
5 5 58 8 8×(
−
),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
7 7 710 10 10−
3 3 310 10 10),
=
×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
5 5 58 8 8×
,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
2 2 25 5 5,
=
;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
1 1 14 4 4;
(4)
×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
53 53 5354 54 54×55,
=
×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
53 53 5354 54 54×(54+1),
=
×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
53 53 5354 54 54×54+
×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
53 53 5354 54 54×1,
=53+
,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
53 53 5354 54 54,
=53
;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
53 53 5354 54 54;
(5)3.8×
+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
1 1 14 4 4+7.2÷4-0.25,
=3.8×
+7.2×
-1×
,
=(3.8+7.2-1)×
1 1 14 4 4+7.2×
-1×
,
=(3.8+7.2-1)×
1 1 14 4 4-1×
,
=(3.8+7.2-1)×
1 1 14 4 4,
=(3.8+7.2-1)×
问题解析 问题解析
(1)(3)运用乘法分配律简算;
(2)先把7×8结合在一起,再运用乘法分配律简算;
(4)先把55分解成54+1,再运用乘法分配律简算;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的乘法. (1)(3)运用乘法分配律简算;
(2)先把7×8结合在一起,再运用乘法分配律简算;
(4)先把55分解成54+1,再运用乘法分配律简算;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的乘法.名师点评 名师点评
本题考点: 本题考点:
整数、分数、小数、百分数四则混合运算;运算定律与简便运算;分数的四则混合运算. 整数、分数、小数、百分数四则混合运算;运算定律与简便运算;分数的四则混合运算.
考点点评: 考点点评:
此题主要考查分数的四则混合运算的运算顺序,以及应用运算定律进行简便计算的能力. 此题主要考查分数的四则混合运算的运算顺序,以及应用运算定律进行简便计算的能力.
var userCity = "\u4e50\u5c71",
userProvince = "\u56db\u5ddd",
zuowenSmall = "1";
2 |
3 |
1 |
4 |
=12×
2 |
3 |
1 |
4 |
=8-3,
=5;
(2)(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
2 |
3 |
1 |
4 |
=12×
2 |
3 |
1 |
4 |
=8-3,
=5;
(2)(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
1 |
4 |
=12×
2 |
3 |
1 |
4 |
=8-3,
=5;
(2)(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
2 |
3 |
1 |
4 |
=8-3,
=5;
(2)(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
1 |
4 |
=8-3,
=5;
(2)(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
5 |
7 |
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
7 |
8 |
=(
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
5 |
7 |
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
7 |
8 |
=(5×8)+(7×7),
=40+49,
=89;
(3)
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
5 |
8 |
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
7 |
10 |
3 |
10 |
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
5 |
8 |
=
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
5 |
8 |
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
7 |
10 |
3 |
10 |
=
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
5 |
8 |
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
2 |
5 |
=
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
1 |
4 |
(4)
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
53 |
54 |
=
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
53 |
54 |
=
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
53 |
54 |
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
53 |
54 |
=53+
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
53 |
54 |
=53
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
53 |
54 |
(5)3.8×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
1 |
4 |
=3.8×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
1 |
4 |
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
1 |
4 |
1 |
4 |
=(3.8+7.2-1)×
1 |
4 |
=(3.8+7.2-1)×
作业帮用户
2017-11-05
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作业帮用户作业帮用户
2017-11-052017-11-05
举报
举报
- 问题解析
- (1)(3)运用乘法分配律简算;
(2)先把7×8结合在一起,再运用乘法分配律简算;
(4)先把55分解成54+1,再运用乘法分配律简算;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的乘法.
(2)先把7×8结合在一起,再运用乘法分配律简算;
(4)先把55分解成54+1,再运用乘法分配律简算;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的乘法.
(2)先把7×8结合在一起,再运用乘法分配律简算;
(4)先把55分解成54+1,再运用乘法分配律简算;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的乘法.
- 名师点评
-
- 本题考点:
- 整数、分数、小数、百分数四则混合运算;运算定律与简便运算;分数的四则混合运算.
-
- 考点点评:
- 此题主要考查分数的四则混合运算的运算顺序,以及应用运算定律进行简便计算的能力.
- 本题考点:
- 整数、分数、小数、百分数四则混合运算;运算定律与简便运算;分数的四则混合运算.
- 本题考点:
- 整数、分数、小数、百分数四则混合运算;运算定律与简便运算;分数的四则混合运算.
- 考点点评:
- 此题主要考查分数的四则混合运算的运算顺序,以及应用运算定律进行简便计算的能力.
- 考点点评:
- 此题主要考查分数的四则混合运算的运算顺序,以及应用运算定律进行简便计算的能力.
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