75. Пропорцияның белгісіз мүшесін табыңдар: 1) x: 20 = 2:5;
3) x:18 = 2; 3;
2) x:18 = 7:9;ө
4) 6:х= 3:7; 5)5:9=15:х. 6)12:7=60:х.
Срочнааааа көмектесинші
Калаййй
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