2-(6 7/8 - 7 1/3):3/4 = 2 11/18
1) 6 7/8 - 7 1/3 = 55/8 - 22/3= -11/24
2) -11/24 : 3/4 = -11/24 * 4/3 = -11/18
3) 2 - (-11/18) = 2 11/18
1)0,9*4,2/6=0,63
2)0,63-7,8=-7,17
2-(6 7/8 - 7 1/3):3/4 = 2 11/18
1) 6 7/8 - 7 1/3 = 55/8 - 22/3= -11/24
2) -11/24 : 3/4 = -11/24 * 4/3 = -11/18
3) 2 - (-11/18) = 2 11/18
1)0,9*4,2/6=0,63
2)0,63-7,8=-7,17