3/5+1/4+7/20= 5/6-7/24+11/12= 5/6+7/9-3/8=

问题描述:

3/5+1/4+7/20= 5/6-7/24+11/12= 5/6+7/9-3/8=
7/8-2/5-1/4= 14/15-(2/3-1/5) 19/20+(4/5-7/40)= 7/6-(7/10-1/3)= (全要递等式)

3/5+1/4+7/20=12/20+5/20+7/20=(12+5+7)/20=24/20=6/55/6-7/24+11/12=20/24-7/24+22/24=(20-7+22)/24=(20-7+22)/24=35/245/6+7/9-3/8=60/72+56/72-27/72=(60+56-27)/72=89/727/8-2/5-1/4=35/40-16/40-10/40=(35-16-1...