题目内容
计算:(7
+6
+5
)÷(1
+1
+1.8).
| 1 |
| 5 |
| 2 |
| 7 |
| 7 |
| 9 |
| 4 |
| 7 |
| 4 |
| 9 |
分析:本题可以先把带分数整数部分和分数部分分别相加,求出这两个括号的运算结果,再相除.
解答:解:(7
+6
+5
)÷(1
+1
+1.8),
=[(7+6+5)+(
+
+
)]÷[(1+1+1)+(
+
+
)],
=[18+
]÷[3+
],
=
×
,
=
,
=4.
| 1 |
| 5 |
| 2 |
| 7 |
| 7 |
| 9 |
| 4 |
| 7 |
| 4 |
| 9 |
=[(7+6+5)+(
| 63 |
| 315 |
| 90 |
| 315 |
| 245 |
| 315 |
| 180 |
| 315 |
| 140 |
| 315 |
| 252 |
| 315 |
=[18+
| 398 |
| 315 |
| 572 |
| 315 |
=
| 6068 |
| 315 |
| 315 |
| 1517 |
=
| 6068 |
| 1517 |
=4.
点评:本题数字较大,注意每一步的准确性.
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