2) x/6 =4/3  x=? 3)12/x = 4/5 x=? 4)19/18 = x/6 x=? 5)15/x = 17/34 x=? 6)19/38 = 8/x x=? 9)5/6 = 10/x+2 x=? 10)x+37/309 = 82/246 x=?   из любых источников главное правильно!!!!
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