题目内容
2
÷1.6+[1
-0.21÷(5-4.82)]×(4
-1.25).
| 2 |
| 7 |
| 1 |
| 6 |
| 8 |
| 15 |
分析:此题算式较长,但在计算过程中发现,中括号内的结果为0,于是[1
-0.21÷(5-4.82)]×(4
-1.25)=0,只计算2
÷1.6即可.
| 1 |
| 6 |
| 8 |
| 15 |
| 2 |
| 7 |
解答:解:2
÷1.6+[1
-0.21÷(5-4.82)]×(4
-1.25),
=
÷
+[1
-0.21÷0.18]×(4
-1
),
=
×
+[1
-1
]×(4
-1
),
=
+0×(4
-1
),
=
.
| 2 |
| 7 |
| 1 |
| 6 |
| 8 |
| 15 |
=
| 16 |
| 7 |
| 8 |
| 5 |
| 1 |
| 6 |
| 8 |
| 15 |
| 1 |
| 4 |
=
| 16 |
| 7 |
| 5 |
| 8 |
| 1 |
| 6 |
| 1 |
| 6 |
| 8 |
| 15 |
| 1 |
| 4 |
=
| 10 |
| 7 |
| 8 |
| 15 |
| 1 |
| 4 |
=
| 10 |
| 7 |
点评:在计算中,应注意“0”的特殊作用.
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