81.1 Найдите неизвестный член пропорции:
8
1) x: 8/9 = 3:4;

3) 12:7 = 9: x;
2) x:2, 8 = 5:7; 4) 6,5:5,2 = x:8;
5) 4,5:3,6 = x:4;
6) 15:4 = x:1целых и 1/3
пж дам 35​
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