题目内容
(1-
)×(1-
)×(1-
)×(1-
)×(1-
)×(1-
)×(1-
)×(1-
)
| 3 |
| 2×4 |
| 3 |
| 3×5 |
| 3 |
| 4×6 |
| 3 |
| 5×7 |
| 3 |
| 6×8 |
| 3 |
| 7×9 |
| 3 |
| 8×10 |
| 3 |
| 9×11 |
分析:先化简每个分数,再求出每个括号的得数,最后约分即可求出结果.
解答:解:(1-
)×(1-
)×(1-
)×(1-
)×(1-
)×(1-
)×(1-
)×(1-
),
=(1-
)×(1-
)×(1-
)×(1-
)×(1-
)×(1-
)×(1-
)×(1-
),
=
×
×
×
×
×
×
×
,
=
.
| 3 |
| 2×4 |
| 3 |
| 3×5 |
| 3 |
| 4×6 |
| 3 |
| 5×7 |
| 3 |
| 6×8 |
| 3 |
| 7×9 |
| 3 |
| 8×10 |
| 3 |
| 9×11 |
=(1-
| 3 |
| 8 |
| 3 |
| 5 |
| 1 |
| 8 |
| 3 |
| 35 |
| 1 |
| 16 |
| 1 |
| 21 |
| 3 |
| 80 |
| 1 |
| 33 |
=
| 5 |
| 8 |
| 2 |
| 5 |
| 7 |
| 8 |
| 32 |
| 35 |
| 15 |
| 16 |
| 20 |
| 21 |
| 77 |
| 80 |
| 32 |
| 33 |
=
| 1 |
| 3 |
点评:对于巧算的题目,应认真分析,根据数字特点,进行计算.
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