4/18:2/9=4/18*9/2=1 13/40:39/80=13/40*80/13=2/3 7/15:3/10=7/15*10/3=1 5/9
15/24:9/10=15/24*10/9=25/36 5/12:25/36=5/12*36/25=3/5
11/25:9/25=11/25*25/9=11/9=1 2/9
<span>х×6/15=12/35 x:13/28=7/5 7/11*x=5/22 24/65:x=12/13
x=12/35*15/6 x=7/5*13/28 x=5/22*11/7 x=24/65*13/12
x=6/7 x=13/20 x=5/14 x=26/65
(1/5+1/2):2-3/10=7/10:2-3/10=7/20-3/10=1/20
1/3*(3/5*5/7)+1/3*(5/9*9/7)=1/3*3/7+1/3*5/7=1/7+5/21=8/21
7/12*6/17+1/8:17/6=7/34+3/68=17/68
</span>
1. 39:13=3
2. 23*3=69
3. 69-18=51
23*39:13-18=51
|AB| = |-9 - 1| = |-10| = 10