1)сократите дробь: 4y / 10xy-14y 2)сократите дробь: 12c / 54cd-36c 3)сократите

Сократим дроби:

1) 4у/(10ху - 14у) = 4у/(2у * (5х - 7)) = 2у/(5х - 7);
2) 12с/(54сd - 36c) = 12c/(18c * (3d - 2c)) = 2c/(3 * (3d - 2c));
3) 4ab/8b = a/2b;
4) (21mn - 63m)/49mn = 7m * (3n - 9m)/49mn = (3n - 9m)/7n;
5) (45d + 10cd)/50d = 5d * (9d + 2c)/50d = (9d + 2c)/10d.