9. Найдите верную пропорцию.

а) 2:5=4:12; б) 3:7=9:27;

в) 5:2=12:4; г) 12:5=2:4.

10. Найти неизвестный член пропорции:

х/7=1/7:1/2 х:7=1/7:1/2

а) 2; б) 7; в) 1/7; г) 2/7.
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