1/1*2+1/2*3+1/3*4+.+1/49*50
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1/1*2+1/2*3+1/3*4+.+1/49*501/1*2+1/2*3+1/3*4+.+1/49*501/1*2+1/2*3+1/3*4+.+1/49*501/1*2+1/2*3+1/3*4+…
1/1*2+1/2*3+1/3*4+.+1/49*50
1/1*2+1/2*3+1/3*4+.+1/49*50
1/1*2+1/2*3+1/3*4+.+1/49*50
1/1*2+1/2*3+1/3*4+…+1/49*50
=1-1/2+1/2-1/3+.+1/48-1/49+1/49-1/50
=1-1/50
=49/50
=(1-1/2)+(1/2-1/3)+...+(1/49-1/50)
=1-1/50
=49/50