题目内容
计算:(1)-16+23+(-17)-(-7);
(2)(-
| 1 |
| 8 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 2 |
| 3 |
| 4 |
(3)(-
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
(4)-14+(1-0.5)×
| 1 |
| 3 |
分析:(1)先化简,再根据有理数的加减混合运算法则计算;
(2)先化简,再利用加法的交换、结合律简便运算;
(3)利用乘法分配律简便运算;
(4)根据有理数混合运算的顺序,先算乘方再算乘除最后算加减,有括号的先算括号里面的.
(2)先化简,再利用加法的交换、结合律简便运算;
(3)利用乘法分配律简便运算;
(4)根据有理数混合运算的顺序,先算乘方再算乘除最后算加减,有括号的先算括号里面的.
解答:解:(1)-16+23+(-17)-(-7)
=-16+23-17+7
=-33+30
=-3;
(2)(-
)+(-
)-(-
)-(+
)-(-
)
=-
+
-
+
-
=(-
+
)-
+
-
=
-
=
;
(3)(-
+
-
)×(-16)
=(-
)×(-16)+
×(-16)-
×(-16)
=8-12+10
=18-12
=6;
(4)-14+(1-0.5)×
×〔2-(-3)2〕
=-1+
×
×(2-9)
=-1+
=
.
=-16+23-17+7
=-33+30
=-3;
(2)(-
| 1 |
| 8 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 2 |
| 3 |
| 4 |
=-
| 1 |
| 8 |
| 3 |
| 8 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 2 |
=(-
| 1 |
| 8 |
| 3 |
| 8 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 3 |
| 4 |
| 1 |
| 2 |
=
| 1 |
| 4 |
(3)(-
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
=(-
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
=8-12+10
=18-12
=6;
(4)-14+(1-0.5)×
| 1 |
| 3 |
=-1+
| 1 |
| 2 |
| 1 |
| 3 |
=-1+
| 7 |
| 6 |
=
| 1 |
| 6 |
点评:本题主要考查有理数的混合运算以及运算定律的运用,运用运算定律使运算更加简便.
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