已知1-1/2=1/2,1/2-1/3=1/6,1/3-1/4=1/12,1/4-1/5=1/20...根据这些等式求1/1*2+1/2*3+1/3*4+...+1/49*50
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已知1-1/2=1/2,1/2-1/3=1/6,1/3-1/4=1/12,1/4-1/5=1/20...根据这些等式求1/1*2+1/2*3+1/3*4+...+1/49*50
已知1-1/2=1/2,1/2-1/3=1/6,1/3-1/4=1/12,1/4-1/5=1/20...根据这些等式求1/1*2+1/2*3+1/3*4+...+1/49*50
已知1-1/2=1/2,1/2-1/3=1/6,1/3-1/4=1/12,1/4-1/5=1/20...根据这些等式求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+1/3-1/4+……+1/49-1/50
=1-1/50
=49/50