计算1/1x4+1/4x7+1/7x10+.+1/91x94

题目详情

▼优质解答

答案和解析

=1/3(1-1/4)+1/3(1/4-1/7)+.+1/3(1/91-1/94)
=1/3(1-1/4+1/4-1/7+.1/91-1/94)
=1/3(1-1/94)
=1/3*93/94
=31/94

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