(1+1/2)x(1+1/3)x(1+1/4)x.x(1+1/18)x(1+1/19)x(1+1/20)是多少
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(1+1/2)x(1+1/3)x(1+1/4)x.x(1+1/18)x(1+1/19)x(1+1/20)是多少
(1+1/2)x(1+1/3)x(1+1/4)x.x(1+1/18)x(1+1/19)x(1+1/20)是多少
(1+1/2)x(1+1/3)x(1+1/4)x.x(1+1/18)x(1+1/19)x(1+1/20)是多少
(1+1/2)=3/2
(1+1/3)=4/3
(1+1/4)=5/4.以此类推
所以原式=(3/2) * (4/3) * (5/4) *.(21/20)
分子和分母可以互相消去
得到答案就是 21/2
!好人一生平安
21/2
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