题目内容
10÷[
-(
÷
+
)].
| 8 |
| 3 |
| 5 |
| 13 |
| 5 |
| 26 |
| 2 |
| 5 |
分析:先算小括号内的除法,把
变为2+
,原式变为10÷[2+
-(2+
)],中括号内运用减法的性质简算,最后算括号外的除法.
| 8 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
解答:解:10÷[
-(
÷
+
)],
=10÷[
-(
×
+
)],
=10÷[2+
-(2+
)],
=10÷[2+
-2-
],
=10÷[
-
],
=10×
,
=37
.
| 8 |
| 3 |
| 5 |
| 13 |
| 5 |
| 26 |
| 2 |
| 5 |
=10÷[
| 8 |
| 3 |
| 5 |
| 13 |
| 26 |
| 5 |
| 2 |
| 5 |
=10÷[2+
| 2 |
| 3 |
| 2 |
| 5 |
=10÷[2+
| 2 |
| 3 |
| 2 |
| 5 |
=10÷[
| 2 |
| 3 |
| 2 |
| 5 |
=10×
| 15 |
| 4 |
=37
| 1 |
| 2 |
点评:考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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