1/4+5/12=2/31/4+5/12=3/12+5/12=8/12=2/32/3-1/6+1/3=5/62/3-1/6+1/3=2/3+1/3-1/6=1-1/6=5/68/15-1/5=1/38/15-1/5=8/15-3/15=5/15=1/34/3+3/8=41/244/3+3/8=32/24+9/24=41/24谢谢，请采纳
