(1-1/2)X(1-1/3)X...X(1-1/19)X(1-1/20)等于多少快
网友回答
(1-1/2)X(1-1/3)X...X(1-1/19)X(1-1/20)
=1/2X2/3X3/4.19/20
=1/20祝开心======以下答案可供参考======
供参考答案1:
(1-1/2)X(1-1/3)X...X(1-1/19)X(1-1/20)
=1/2×2/3×3/4×....×18/19×19/20
=1/20供参考答案2:
(1-1/2)X(1-1/3)X...X(1-1/19)X(1-1/20)
=1/2X2/3X...X18/19X19/20
=1/20供参考答案3:
(1-1/2)X(1-1/3)X...X(1-1/19)X(1-1/20）
=1/2*2/3*3/4*4/5* *18/19*19/20
=1/20