题目内容
计算:
(1)(-4)-(-1)+(-6)÷2
(2)(-2)4÷(-2
)2+5
×(-
)-0.25.
(1)(-4)-(-1)+(-6)÷2
(2)(-2)4÷(-2
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
分析:(1)先算除法,再算加减;
(2)先算乘方,再算乘除,最后算加减.
(2)先算乘方,再算乘除,最后算加减.
解答:解:(1)原式=-4+1-3
=-7+1
=-6;
(2)原式=16÷
+
×(-
)-0.25
=16×
-
-
=
-
-
═
-
-
=2-
=
.
=-7+1
=-6;
(2)原式=16÷
| 64 |
| 9 |
| 11 |
| 2 |
| 1 |
| 6 |
=16×
| 9 |
| 64 |
| 11 |
| 12 |
| 1 |
| 4 |
=
| 9 |
| 4 |
| 11 |
| 12 |
| 1 |
| 4 |
═
| 9 |
| 4 |
| 1 |
| 4 |
| 11 |
| 12 |
=2-
| 11 |
| 12 |
=
| 13 |
| 12 |
点评:此题考查有理数的混合运算,注意抓住运算顺序和每一步的运算符号.
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