题目内容
计算:(1)(-0.25)×(-7.99)×400;
(2)-72+2×(-3)2+(-6)÷(-
)2.
(2)-72+2×(-3)2+(-6)÷(-
| 1 |
| 3 |
(1)原式=
×7.99×400
=100×7.99
=799.
(2)原式=-49+2×9-6÷
=-49+18-54
=-85.
| 1 |
| 4 |
=100×7.99
=799.
(2)原式=-49+2×9-6÷
| 1 |
| 9 |
=-49+18-54
=-85.
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