две целых три сотых X-одны целыя две сотых X

1). 2/3х - 1/2х = 4/6х - 3/6х = 1/6х
2/3 = 4/6 - доп.множ. 2
1/2 = 3/6 - доп.множ. 3

2) 1/4х + 1/3х = 3/12х + 4/12х = 7/12х
1/4 = 3/12 - доп.множ. 3
1/3 = 4/12 - доп.множ. 4