решить уравнение:
9/25 : 4x/5=21/20 : 63/100
/-дробь

9/25 : 4х/5 = 21/20 : 63/100 9/25 : 4х/5 = 9х/20 21/20 : 63/100 = 15/9 = 5/3 9х/20 = 5/3 9х • 3 = 5 • 20 27х = 100 Х = 100/27 = 3 19/27