（8/1+24/1+48/1+80/1+120//1+168/1）*56

可乐烤肉2022-10-04 11:39:545条回答

（8/1+24/1+48/1+80/1+120//1+168/1）*56
（8/1+1/24+1/48+1/80+1/120+1/168）*56 上面打错了。。这道才对

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疑心太重共回答了15个问题 | 采纳率93.3%: (1/8+1/24+1/48+1/80+1/120+1/168)*56
=[1/(2*4)+1/(4*6)+1/(6*8)+1/(8*10)+1/(10*12)+1/(12*14)]*56
=1/2*(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12+1/12-1/14)*56
=1/2*(1/2-1/14)*56
=12; 1年前