2^2/(1*3)+4^2/(3*5)+^.+20^2/(19*21)=RT

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[-2*1/4+(-1/2)3]*(-2*2/3)+(-1*2/3)2÷5/3 (-2/3)+1/2+4/5+(-1/2)+(-1/3) 1 2 3 4 5 1 2 1+1+2+2+3+4+5 1+1 2+2 3+3 4+4 5+5 1,2,3,4,5 1,2,3,4,5, 1 2 3 4 5 1,2,3,4,5 1,2,3,4,5, 1 2 3 4 5 1,2,3,4,5, .1,2,3,4,5, 1,2,3,4,5, 1,2,3,4,5, 1 2 3 4 5 1、2、3、4、5 1,2,3,4,5,