(1+1/2)*(1+1/4)*(1+1/5)*……*(1+1/10)*(1-1/3)*(1-1/5)*(1-1/6)*
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(1+1/2)*(1+1/4)*(1+1/5)*……*(1+1/10)*(1-1/3)*(1-1/5)*(1-1/6)*……*(1-1/9)怎么简便计算?
![(1+1/2)*(1+1/4)*(1+1/5)*……*(1+1/10)*(1-1/3)*(1-1/5)*(1-1/6)*](/uploads/image/z/17157502-46-2.jpg?t=%281%2B1%2F2%29%2A%281%2B1%2F4%29%2A%281%2B1%2F5%29%2A%E2%80%A6%E2%80%A6%2A%281%2B1%2F10%29%2A%281-1%2F3%29%2A%281-1%2F5%29%2A%281-1%2F6%29%2A)
(1+1/2)*(1+1/4)*(1+1/6)*……*(1+1/10)*(1-1/3)*(1-1/5)*(1-1/7)*……*(1-1/9)
=3/2×5/4×7/6×9/8×11/10×2/3×4/5×6/7×8/9
=3/2×2/3×5/4×4/5×7/6×6/7××9/8×8/9×11/10
=11/10
前部分分母是2、4、6、8、10,后部分分子是3、5、7、9,除1+1/10,可配成4对倒数.
原题中1-1/6应为1-1/7
再问: 还有一个1/5哪去了?
再答: 1-1/5=4/5
=3/2×5/4×7/6×9/8×11/10×2/3×4/5×6/7×8/9
=3/2×2/3×5/4×4/5×7/6×6/7××9/8×8/9×11/10
=11/10
前部分分母是2、4、6、8、10,后部分分子是3、5、7、9,除1+1/10,可配成4对倒数.
原题中1-1/6应为1-1/7
再问: 还有一个1/5哪去了?
再答: 1-1/5=4/5
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