题目内容
(1+
)(1+
)(1+
)(1-
)(1-
)(1-
)
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| 2 |
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| 6 |
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| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
考点:分数的巧算
专题:计算问题(巧算速算)
分析:先求出每个括号内的结果,然后运用约分的方法,解决问题.
解答:
解:(1+
)(1+
)(1+
)(1-
)(1-
)(1-
)
=
×
×
×
×
×
=(
×
)×(
×
)×(
×
)
=1×1×1
=1
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=
| 3 |
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=(
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=1×1×1
=1
点评:仔细观察题目中数字构成的特点和规律,运用运算定律或运算技巧,进行简便计算.
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