数学分数，的1⼀3*3⼀5+1=

1/3*3/5+1=1又1/5
5/7-5/9*5/7=5/7*4/9=20/63
1-5/7*21/25=1-3/5=2/5
1/2+5/4*4/5=1/2+1=1又1/2
1/6*（5-3/2）=1/6*7/2=7/12
7/8*7+3/8=49/8+3/8=52/8=13/2=6又1/2
11/24*5/6=55/144
1/4*2/7=1/14
12/7*6+5/12*6=(12/7+5/12)*6=1*6=6
3/5*5/6=1/2
5/13*4/7*14=40/13=3又1/13
4/9*5*18=40

1/3*3/5+1=6/5 5/7-5/9*5/7=20/63 1-5/7*21/25=2/5 1/2+5/4*4/5=3/2
1/6*（5-3/2)=7/12 7/8*7+3/8= 13/2 11/24*5/6=55/144 1/4*2/7=1/14 12/7*6+5/12*6=179/14 3/5*5/6=1/2 5/13*4/7*14=40/13 4/9*5*18=40

6/5 20/63 2/5 3/2 7/12 13/2
55/144 1/14 179/14 1/2 40/13 40