题目内容
阅读计算过程:
3
-22÷[(
)2-(-3+0.75)]×5
原式=3
-22÷[
-3+
]×5①
=3
+4÷[-2]×5②
=3
+
③
=3
回答下列问题:
(1)步骤①错在______;
(2)步骤①到步骤②错在______;
(3)步骤②到步骤③错在______;
(4)此题的正确结果是______.
3
| 1 |
| 3 |
| 1 |
| 2 |
原式=3
| 1 |
| 3 |
| 1 |
| 4 |
| 3 |
| 4 |
=3
| 1 |
| 3 |
=3
| 1 |
| 3 |
| 2 |
| 5 |
=3
| 11 |
| 15 |
回答下列问题:
(1)步骤①错在______;
(2)步骤①到步骤②错在______;
(3)步骤②到步骤③错在______;
(4)此题的正确结果是______.
(1)去括号错误;
(2)乘方计算错误;
(3)运算顺序错误;
(4)原式=3
-4÷[
+3-
]×5
=3
-4÷
×5
=3
-4×
×5
=3
-8
=-4
.
(2)乘方计算错误;
(3)运算顺序错误;
(4)原式=3
| 1 |
| 3 |
| 1 |
| 4 |
| 3 |
| 4 |
=3
| 1 |
| 3 |
| 5 |
| 2 |
=3
| 1 |
| 3 |
| 2 |
| 5 |
=3
| 1 |
| 3 |
=-4
| 2 |
| 3 |
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