计算1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7的值
4个回答
1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
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