1/10×11+1/11×12+1/12×13+1/13×14

题目详情

1/10×11 +1/11×12 +1/12×13 +1/13×14

▼优质解答

答案和解析

1/10×11 +1/11×12 +1/12×13 +1/13×14
=1/10-1/11+1/11-1/12+1/12-1/13+1/13-1/14
=1/10-1/14
=1/35

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