题目内容
计算:
(1)23×(-5)-(-3)÷
;
(2)(7m2n-5mn)-(4m2n-5mn);
(3)(-
)×(
-
)×
÷(-
);
(4)-23+[(-4)2-(1-32)×3].
(1)23×(-5)-(-3)÷
| 3 |
| 128 |
(2)(7m2n-5mn)-(4m2n-5mn);
(3)(-
| 7 |
| 2 |
| 1 |
| 6 |
| 1 |
| 2 |
| 3 |
| 14 |
| 1 |
| 2 |
(4)-23+[(-4)2-(1-32)×3].
(1)原式=-115+128=13;
(2)原式=7m2n-5mn-4m2n+5mn=3m2n;
(3)原式=-
×(-
)×
×(-2)=-
;
(4)原式=-8+(16+24)=32.
(2)原式=7m2n-5mn-4m2n+5mn=3m2n;
(3)原式=-
| 7 |
| 2 |
| 1 |
| 3 |
| 3 |
| 14 |
| 1 |
| 2 |
(4)原式=-8+(16+24)=32.
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