1е задание: 4/18÷2/9; 13/40÷39/80; 7/15÷3/10; 15/24÷9/10; 5/12÷25/36; 11/25÷9/25.
2-е задание:
а) х×6/15=12/35; б)х÷13/28=7/5; в) 24/65÷х=12/13; г) 7/11×х=5/22.
3-е задание: а)(1/5+1/2)÷2-3/10; б) 1/3 ×(3/5 × 5/7)+1/3×(5/9×9/7); в) 7/12×6/17+1/8÷17/6
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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
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