早教吧作业答案频道 -->数学-->
用简便方法计算:(1)−1.53×0.75+1.53×12+45×1.53(2)(213−312+1912)÷(−116).
题目详情
用简便方法计算:
(1)−1.53×0.75+1.53×
+
×1.53
(2)(2
−3
+1
)÷(−1
).
(1)−1.53×0.75+1.53×
1 |
2 |
4 |
5 |
(2)(2
1 |
3 |
1 |
2 |
9 |
12 |
1 |
6 |
▼优质解答
答案和解析
(1)-1.53×0.75+1.53×
+
×1.53,
=1.53×(-0.75+0.5+0.8),
=1.53×(1.3-0.75),
=1.53×0.55,
=0.8415;
(2)(2
-3
+1
)÷(-1
),
=(
-
+
)×(-
),
=
×(-
)-
×(-
)+
×(-
),
=-2+3-
,
=3-3
,
=-
.
1 |
2 |
4 |
5 |
=1.53×(-0.75+0.5+0.8),
=1.53×(1.3-0.75),
=1.53×0.55,
=0.8415;
(2)(2
1 |
3 |
1 |
2 |
9 |
12 |
1 |
6 |
=(
7 |
3 |
7 |
2 |
21 |
12 |
6 |
7 |
=
7 |
3 |
6 |
7 |
7 |
2 |
6 |
7 |
21 |
12 |
6 |
7 |
=-2+3-
3 |
2 |
=3-3
1 |
2 |
=-
1 |
2 |
看了 用简便方法计算:(1)−1....的网友还看了以下:
观察下列等式:1^3=1^2,1^3+2^3=3^2,1^3+2^3+3^3=6^2,1^3+2^ 2020-05-15 …
8年级数学题:3的n次方+m能被13整除,证明3的n+3次方能被13整除.急用,谢谢刚知道:3^( 2020-05-15 …
1/1=11/2+2/2+1/2=21/3+2/3+3/3+2/3+1/3=31/4+2/4+3/ 2020-06-02 …
求解答下面几道数学题!是有关数学归纳法的!谢谢在线等第一题:已知1^3+2^3+3^3+……+n^ 2020-06-06 …
1.直接写得数1/2+1/31/2+1/41/3+1/51/4+2/31/3+3/51/6+2/7 2020-06-13 …
观察各式3*1=3,3*3=9,3*3*3=27,3*3*3*3=81...观察各式3*1=3,3 2020-07-19 …
Tn=3×3+5×3^2+7×3^3+.+(2n-1)×3^n-1+(2n+1)×3^n(3^2表 2020-07-29 …
对于算式2*(3+1)*(3*3+1)*(3*3*3*3+1)*(3*3*3*3*3*3*3*3+ 2020-07-30 …
二次根式√24-(√1/2+2√2/3)-(√1/8-√6)(√18-4√1/2-√3-√2)/√ 2020-07-30 …
观察下列各式:1^3+2^3=1+8=9,而(1+2)^2=9……观察下列各式:1^3+2^3=1+ 2021-01-01 …