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(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
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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
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