Question

Номер 618 уравнение решения первыя и второя. И спс

Answer 1

1)
(1 - 7/10)х = 2 1/4
(10/10 - 7/10)х = 2 1/4
3/10х = 2 1/4
3/10х = 9/4
х = 9/4 : 3/10
х = 9/4 * 10/3
х = 3/2 * 5/1
х = 15/2
х = 7 1/2 = 7,5
2)
(1/4 + 1/5)х = 1 4/5
(5/20 + 4/20)х = 1 4/5
9/20х = 9/5
х = 9/5 : 9/20
х = 9/5 * 20/9
х = 4