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脱式计算,能简算的要简算.(1)3-(12.9-84×17)(2)44.4×25(3)4013×(26×340)(4)2-[16+(34-710)](5)7.25×1.8+27.5×0.18(6)905×99+905(7)[(1419-513)+(519-813)]÷1112(8)
题目详情
脱式计算,能简算的要简算.
(1)3-(12.9-84×
| (2)44.4×25 | ||||||||||||||||
(3)
| (4)2-[
| ||||||||||||||||
(5)7.25×1.8+27.5×0.18 | (6)905×99+905 | ||||||||||||||||
(7)[(
| (8)34×(
| ||||||||||||||||
(9)2000÷12.5÷25÷0.8÷4 | (10)
| ||||||||||||||||
(11)[(
| (12)(
|
▼优质解答
答案和解析
(1)3-(12.9-84×
)
=3-(12.9-12)
=3-0.9
=2.1
(2)44.4×25
=11.1×(4×25)
=11.1×100
=1110
(3)
×(26×
)
=(
×
)×26
=
×26
=6
(4)2-[
+(
-
)]
=2-[
+
]
=2-
=1
(5)7.25×1.8+27.5×0.18
=7.25×1.8+2.75×1.8
=(7.25+2.75)×1.8
=10×1.8
=18
(6)905×99+905
=905×(99+1)
=905×100
=90500
(7)[(
-
)+(
-
)]÷
=[(
+
)-(
+
)]÷
=[1-1]÷
=0÷
=0
(8)34×(
+
)×13
=34×13×
+
×13×34
=26+34
=60
(9)2000÷12.5÷25÷0.8÷4
=2000÷(12.5×25×0.8×4)
=2000÷[(12.5×0.8)×(25×4)]
=2000÷1000
=2
(10)
×
+
÷
=
×
+
×
=
×(
+
)
=
×1
=
(11)[(
-
)×
]÷
=[
×
]÷
=
×
=
(12)(
+
)÷(
÷4-
)
=
÷(
-
)
=
÷
=
1 |
7 |
=3-(12.9-12)
=3-0.9
=2.1
(2)44.4×25
=11.1×(4×25)
=11.1×100
=1110
(3)
40 |
13 |
3 |
40 |
=(
40 |
13 |
3 |
40 |
=
3 |
13 |
=6
(4)2-[
1 |
6 |
3 |
4 |
7 |
10 |
=2-[
1 |
6 |
1 |
20 |
=2-
13 |
60 |
=1
47 |
60 |
(5)7.25×1.8+27.5×0.18
=7.25×1.8+2.75×1.8
=(7.25+2.75)×1.8
=10×1.8
=18
(6)905×99+905
=905×(99+1)
=905×100
=90500
(7)[(
14 |
19 |
5 |
13 |
5 |
19 |
8 |
13 |
11 |
12 |
=[(
14 |
19 |
5 |
19 |
5 |
13 |
8 |
13 |
11 |
12 |
=[1-1]÷
11 |
12 |
=0÷
1 |
12 |
=0
(8)34×(
1 |
17 |
1 |
13 |
=34×13×
1 |
17 |
1 |
13 |
=26+34
=60
(9)2000÷12.5÷25÷0.8÷4
=2000÷(12.5×25×0.8×4)
=2000÷[(12.5×0.8)×(25×4)]
=2000÷1000
=2
(10)
2 |
5 |
11 |
15 |
2 |
5 |
15 |
4 |
=
2 |
5 |
11 |
15 |
2 |
5 |
4 |
15 |
=
2 |
5 |
11 |
15 |
4 |
15 |
=
2 |
5 |
=
2 |
5 |
(11)[(
4 |
5 |
1 |
4 |
6 |
11 |
9 |
20 |
=[
11 |
20 |
6 |
11 |
9 |
20 |
=
3 |
10 |
20 |
9 |
=
2 |
3 |
(12)(
1 |
2 |
1 |
4 |
4 |
5 |
1 |
10 |
=
3 |
4 |
1 |
5 |
1 |
10 |
=
3 |
4 |
1 |
10 |
=
15 |
2 |
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