1/1x6+1/6x11+1/11x16+.+1/51x56

题目详情

▼优质解答

答案和解析

1/1x6+1/6x11+1/11x16+.+1/51x56
=（1-1/6+1/6-1/11+/11-1/16+……+1/51-1/56）÷5
=（1-1/56）÷5
=55/56÷5
=11/56

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