题目内容
计算:[50-(
-
+
)×(-6)2]÷(-7)2.
| 7 |
| 9 |
| 11 |
| 12 |
| 1 |
| 6 |
原式=[50-(
-
+
)×36]÷49
=[50-(
×36-
×36+
×36)]÷49
=[50-(28-33+6)]÷49
=(50-1)÷49
=49÷49
=1.
| 7 |
| 9 |
| 11 |
| 12 |
| 1 |
| 6 |
=[50-(
| 7 |
| 9 |
| 11 |
| 12 |
| 1 |
| 6 |
=[50-(28-33+6)]÷49
=(50-1)÷49
=49÷49
=1.
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