早教吧作业答案频道 -->数学-->
（6）(1-1/2×2)×(1-1/3×3)×(1-1/4×4)×A×(1-1/10×10)（5）1/1×2+1/2×3+1/3×4+K+1/8×9+1/9×10
题目详情
（6）(1-1/2×2)×(1-1/3×3)×(1-1/4×4)×A×(1-1/10×10) （5）1/1×2+1/2×3+1/3×4+K+1/8×9+1/9×10
▼优质解答
答案和解析
(1-1/2×2)×(1-1/3×3)×(1-1/4×4)×A×(1-1/10×10)
=0*0*0*...*0
=0
1/1×2+1/2×3+1/3×4+K+1/8×9+1/9×10
=1-1/2+(1/2-1/3)+(1/3-1/4)+...+(1/9-1/10)
=1-1/10
=9/10
=0*0*0*...*0
=0
1/1×2+1/2×3+1/3×4+K+1/8×9+1/9×10
=1-1/2+(1/2-1/3)+(1/3-1/4)+...+(1/9-1/10)
=1-1/10
=9/10
看了 （6）(1-1/2×2)×(...的网友还看了以下：