题目内容
计算下列各题
①(
-
+
)÷
②[(-5)2×(-
)+15]×(-2)3÷7.
①(
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
②[(-5)2×(-
| 3 |
| 5 |
①(
-
+
)÷
=(
-
+
)×12
=
×12-
×12+
×12
=3-6+2
=-1;
②[(-5)2×(-
)+15]×(-2)3÷7
=[25×(-
)+15]×(-8)÷7
=[-15+15]×(-8)÷7
=0×(-8)÷7
=0.
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
=(
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 6 |
=
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 6 |
=3-6+2
=-1;
②[(-5)2×(-
| 3 |
| 5 |
=[25×(-
| 3 |
| 5 |
=[-15+15]×(-8)÷7
=0×(-8)÷7
=0.
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