упростите выражение 2/3*(1,8-1 1/4m)-2 1/3*(1,2-5/14m)

1) 2/3 • ( 1,8 - 1/4m ) = 2/3•9/5 - 2/3•1/4m = 6/5 - 1/6m = 1,2 - 1/6m 2) 2 1/3 • ( 1,2 - 5/14m ) = 7/3 • ( 3/2 - 5/14m ) = 7/3•3/2 - 7/3•5/14m = 7/2 - 5/6m = 3,5 - 5/6m 3) 1,2 - 1/6m - ( 3,5 - 5/6m ) = 1,2 - 1/6m - 3,5 + 5/6m = 4/6m - 2,3 = 2/3m - 2,3 Ответ 2/3m - 2,3