观察下列各式 1/6=1/2×3=1/2-1/3 1/12=1/3×4=1/3-1/4 1/20=1/4×5=1/4-1/5
(1)猜想:1/n(n+1)=___________(2)化简:1/(n+1)(n+2)+1/(n+2)(n+3)+1/(n+3)(n+4)...
(1)猜想:1/n(n+1)=___________
(2)化简:1/(n+1)(n+2)+1/(n+2)(n+3)+1/(n+3)(n+4) 展开
(2)化简:1/(n+1)(n+2)+1/(n+2)(n+3)+1/(n+3)(n+4) 展开
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