题目内容
计算(1)(
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 18 |
| 1 |
| 3 |
(3)(-
| 5 |
| 6 |
| 5 |
| 4 |
| 3 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 4 |
| 11 |
分析:(1)首先利用乘法分配律打开括号,然后计算即可求解;
(2)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;
(3)首先计算括号,然后计算乘除,接着计算加减即可求解;
(4)首先计算括号,然后计算乘除,接着计算加减即可求解.
(2)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;
(3)首先计算括号,然后计算乘除,接着计算加减即可求解;
(4)首先计算括号,然后计算乘除,接着计算加减即可求解.
解答:解:(1)(
-
+
)×(-36)
=-
×36+
×36-
×36
=-20+27-2
=5;
(2)-14-(1-0.5)×
×[2-(-3)2]
=-1+
×
×7
=
;
(3)(-
)÷(-
)×
-(-
)2
=
×
×
-
=
;
(4)-14-(-5
)×
+(-2)3
=-1+
×
-8
=-7.
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 18 |
=-
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 18 |
=-20+27-2
=5;
(2)-14-(1-0.5)×
| 1 |
| 3 |
=-1+
| 1 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 6 |
(3)(-
| 5 |
| 6 |
| 5 |
| 4 |
| 3 |
| 2 |
| 1 |
| 2 |
=
| 5 |
| 6 |
| 4 |
| 5 |
| 3 |
| 2 |
| 1 |
| 4 |
=
| 3 |
| 4 |
(4)-14-(-5
| 1 |
| 2 |
| 4 |
| 11 |
=-1+
| 11 |
| 2 |
| 4 |
| 11 |
=-7.
点评:此题主要考查了有理数的混合运算,解题时注意利用乘法分配律使计算变得简单.
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