Верна ли пропорция?
1. 25:5=20:4
2. 12:16=18:24
3. 100:200=4:8
4. 5:1,5=15:4,5
5. 1,1:22=3,3:66
6. 14:4,9=2/7 :0,1
7. 2,04:0,6=2,72:0,8
8.2/7:0,3=1/2:7/20
9.420:560=1 3/4:2 1/3
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