数学学霸写一下。
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(1)1/56 1/[nx(n+1)]
(2)=1/2+1/(2x3)+1/(3x4)+1/(4x5)+1/(5x6)+1/(6x7)+1/(7x8)+1/(8x9)+1/(9x10)+1/(10x11)+1/(11x12)
=1-1/2+1/2-1/3+....+1/11-1/12
=1-1/12
=11/12
(2)=1/2+1/(2x3)+1/(3x4)+1/(4x5)+1/(5x6)+1/(6x7)+1/(7x8)+1/(8x9)+1/(9x10)+1/(10x11)+1/(11x12)
=1-1/2+1/2-1/3+....+1/11-1/12
=1-1/12
=11/12
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