题目内容
计算(1)-|-3|2÷(-3)2;(2)0-(-3)2÷3×(-2)3;
(3)-3
| 1 |
| 2 |
| 3 |
| 5 |
| 5 |
| 14 |
| 1 |
| 3 |
(5)12÷(-3-
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
分析:(1)(2)(3)(4)首先计算括号内面的,然后计算乘除,接着计算加减即可求解;
(5)首先计算括号内面的,然后把除法改为乘法,接着计算即可求解;
(6)首先利用乘法分配律打开括号,然后计算即可简便求解.
(5)首先计算括号内面的,然后把除法改为乘法,接着计算即可求解;
(6)首先利用乘法分配律打开括号,然后计算即可简便求解.
解答:解:(1)-|-3|2÷(-3)2
=-9÷9
=-1;
(2)0-(-3)2÷3×(-2)3
=0+9÷3×8
=24;
(3)-3
+5
÷(-2)×
=-3
-
÷2×
=-4
;
(4)-14+(1-0.5)×
×[2-(-3)2]
=-1+
×
×(-7)
=-2
;
(5)12÷(-3-
+1
)
=12÷(-1
-
)
=12×(-
)
=-
;
(6)(
-3+
-
)×(-6)2
=
×36-3×36+
×36-
×36
=18-108+30-21
=-81.
=-9÷9
=-1;
(2)0-(-3)2÷3×(-2)3
=0+9÷3×8
=24;
(3)-3
| 1 |
| 2 |
| 3 |
| 5 |
| 5 |
| 14 |
=-3
| 1 |
| 2 |
| 28 |
| 5 |
| 5 |
| 14 |
=-4
| 1 |
| 2 |
(4)-14+(1-0.5)×
| 1 |
| 3 |
=-1+
| 1 |
| 2 |
| 1 |
| 3 |
=-2
| 1 |
| 6 |
(5)12÷(-3-
| 1 |
| 4 |
| 1 |
| 3 |
=12÷(-1
| 1 |
| 4 |
| 2 |
| 3 |
=12×(-
| 12 |
| 23 |
=-
| 144 |
| 23 |
(6)(
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
=
| 1 |
| 2 |
| 5 |
| 6 |
| 7 |
| 12 |
=18-108+30-21
=-81.
点评:此题主要考查了有理数的混合运算法则:解题时首先计算括号内面的,然后计算乘除,接着计算加减即可求解.
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