分数加减混合运算50题 12/3+1/2-3/2=3 6/3-4/2+3/5=3/5 5/5+1/5-2/5=4/5 5/2-3/2+6/2=4 8/3-2/3+1/3=7/3 2/5+1-1/5=6/5 8/3-1/3-2/3+7/3=4 1/7-2/7+1/7=0 1/4+2/4-2/3=1/12 1/3+5/6=7/6 1/3-1/4=1/12 1/5+1/7=12/35 1/5-1/7=2/35 1/4+1/9=13/36 1/4-1/9=5/36 1/8+1/9=17/72 1/8-1/9=1/72 1/10+7/9=79/90 5/7-1/6=23/42 1-5/9=4/9 1/5+3/8=23/40 3/4+1/5=19/20 2/3-3/5=1/5 1-2/5=3/5 5/8-1/9=37/72 1/10-1/20=1/20 1/6+3/8=13/24 5/9-1/2=1/18 2/3+1/4=11/12 1/2+1/3=5/6 5/6+1/18=8/9 3/5-1/3=4/15 17/15-1/3=4/5 本文来源：https://www.wddqw.com/doc/6fa36eebc950ad02de80d4d8d15abe23482f03f2.html