题目内容
计算:
(1)14+(-11)+7
(2)-2×9-8×(-2)
(3)-23×(-
)2-72
(4)30÷(
-
)
(1)14+(-11)+7
(2)-2×9-8×(-2)
(3)-23×(-
| 2 |
(4)30÷(
| 1 |
| 5 |
| 1 |
| 6 |
(1)14+(-11)+7
=14-11+7
=10;
(2)-2×9-8×(-2)
=-18+16
=-2;
(3)-23×(-
)2-72
=-8×
-49
=-49
;
(4)30÷(
-
)
=30÷(
-
)
=30÷
=30×30
=900.
=14-11+7
=10;
(2)-2×9-8×(-2)
=-18+16
=-2;
(3)-23×(-
| 1 |
| 4 |
=-8×
| 1 |
| 16 |
=-49
| 1 |
| 2 |
(4)30÷(
| 1 |
| 5 |
| 1 |
| 6 |
=30÷(
| 6 |
| 30 |
| 5 |
| 30 |
=30÷
| 1 |
| 30 |
=30×30
=900.
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