(1+1/2)乘(1-1/2)乘(1+1/3)乘(1-1/3)乘(1+1/4)乘(1-1/4)....乘(1+1/99)乘1-1/99)
来源:百度知道 编辑:UC知道 时间:2024/06/06 14:43:29
太难了!
(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×…(1-1/99)×(1+1/99)
=1/2×3/2×2/3×4/3×3/4×5/4×…98/99×100/99
=1/2×100/99
=55/99
(1+1/2)*(1-1/2)(1+1/3)*(1-1/3)*.......(1+1/99))*(1-1/99)
=3/2*1/2*4/3*2/3*...*100/99*98/99
=1/2*(3/2*2/3)*(4/3*3/4)*...*(99/98*98/99)*100/99
=1/2*100/99
=50/99
(1+1/2)乘(1-1/2)乘(1+1/3)乘(1-1/3)乘(1+1/4)乘(1-1/4)....乘(1+1/99)乘(1-1/99)
=3/2*1/2*4/3*2/3*...100/99*98/99
=(3/2*4/3*5/4*...100/99)*(1/2*2/3*3/4*...98/99)
=100/2*1/99
=50/99
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