题目内容
计算题
(1)-5÷(1
)×
×(-2
)÷7
(2)-72+2×(-3)2-(-6)÷(-
)2.
(1)-5÷(1
| 2 |
| 7 |
| 4 |
| 5 |
| 1 |
| 4 |
(2)-72+2×(-3)2-(-6)÷(-
| 1 |
| 3 |
(1)-5÷(1
)×
×(-2
)÷7
=5×
×
×
×
=1;
(2)-72+2×(-3)2-(-6)÷(-
)2
=-49+2×9+6×9
=-49+18+54
=23.
| 2 |
| 7 |
| 4 |
| 5 |
| 1 |
| 4 |
=5×
| 7 |
| 9 |
| 4 |
| 5 |
| 9 |
| 4 |
| 1 |
| 7 |
=1;
(2)-72+2×(-3)2-(-6)÷(-
| 1 |
| 3 |
=-49+2×9+6×9
=-49+18+54
=23.
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