Найдите неизвестный член пропорции:
1) x : 20 = 2 : 5
2) х : 18 = 7 : 9
3) х : 18 = 2 : 3
4) 6 : х = 3 : 7
5) 5 : 9 = 15 : х
6) 12 : 7 = 60 : х
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