1⼀2=1-1⼀2,1⼀6=1⼀2-1⼀3,1⼀12=1⼀3-1⼀4......... 请你根据以上的规律计算:

1 1 1 1 1── + ── + ── + ── +── = 6 12 20 30 42
2024-12-04 15:32:38
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回答(1):

原式=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1/2-1/7
=5/14