Ответ:\(126 : 9 = 14\).\(21 : x = \frac{21}{x}\).\((a+21) : 45 = \frac{a+21}{45}\).\(26 : (2a+b) = \frac{26}{2a+b}\).\(152 : (x+2y) = \frac{152}{x+2y}\).\((a+b) : (a-b) = \frac{a+b}{a-b}\).