1/1x6+1/6x11+1/11x16+------+1/46x51

题目详情

1/1x6+1/6x11+1/11x16+ ------+1/46x51

▼优质解答

答案和解析

1/6x1+1/6x11+1/11x16＋+ ------+1/46x51
=1/5x(1-1/6+1/6-1/11+1/11-1/16+…………+1/41-1/46+1/46-1/51)
=1/5x(1-1/51)
=1/5x50/51
=10/51

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