题目内容
计算
(1)(-2)4÷(-2
)2+5
×(-
)-0.25
(2)3
÷(-1
)-
×(-1
)-(-1+
)2.
(1)(-2)4÷(-2
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
(2)3
| 1 |
| 2 |
| 2 |
| 5 |
| 8 |
| 21 |
| 3 |
| 4 |
| 1 |
| 2 |
分析:(1)先算乘方,再算乘除,最后算加减即可;
(2)先算括号里面的,再算乘方,乘除,最后算加减即可.
(2)先算括号里面的,再算乘方,乘除,最后算加减即可.
解答:解:(1)原式=16÷
+
×(-
)-0.25
=16×
-
-0.25
=
-
-
=2-
=
;
(2)原式=
÷(-
)-
×(-
)-
=
×(-
)+
-
=-
+
-
=-
.
| 64 |
| 9 |
| 11 |
| 2 |
| 1 |
| 6 |
=16×
| 9 |
| 64 |
| 11 |
| 12 |
=
| 9 |
| 4 |
| 11 |
| 12 |
| 1 |
| 4 |
=2-
| 11 |
| 12 |
=
| 13 |
| 12 |
(2)原式=
| 7 |
| 2 |
| 7 |
| 5 |
| 8 |
| 21 |
| 7 |
| 4 |
| 1 |
| 4 |
=
| 7 |
| 2 |
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 4 |
=-
| 5 |
| 2 |
| 2 |
| 3 |
| 1 |
| 4 |
=-
| 25 |
| 12 |
点评:本题考查的是有理数的混合运算,即先算乘方,再算乘除,最后算加减;同级运算,应按从左到右的顺序进行计算;如果有括号,要先做括号内的运算.
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