题目内容
计算:
(1)(-2
)-
+(-0.5)-(-1
);
(2)-1-(1+0.5)×
÷(-4);
(3)(-1)3×(-5)÷[(-3)2+2×(-5)].
(1)(-2
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 6 |
(2)-1-(1+0.5)×
| 1 |
| 3 |
(3)(-1)3×(-5)÷[(-3)2+2×(-5)].
(1)原式=(-2
-
)+(-
+1
)
=-2
+
=-2
;
(2)原式=-1-
×
×(-
)
=-1+
=-
;
(3)原式=-1×(-5)÷(9-10)
=-1×(-5)÷(-1)
=-5.
| 1 |
| 3 |
| 1 |
| 2 |
| 5 |
| 6 |
| 1 |
| 6 |
=-2
| 5 |
| 6 |
| 1 |
| 3 |
=-2
| 1 |
| 2 |
(2)原式=-1-
| 3 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=-1+
| 1 |
| 8 |
=-
| 7 |
| 8 |
(3)原式=-1×(-5)÷(9-10)
=-1×(-5)÷(-1)
=-5.
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