Выполните вычитание: 1) 7/8 - (-3/10); 4) -5/9 - (-3/4); 7) 1 3/8 - 3 1/4; 2) 11/12 - 17/18; 5) 3 11/12 - (-4 4/9); 8)

1) 7/8 - (-3/10)=7/8 + 3/10=(35+12)/40=47/40=1 7/40; 2) 11/12 - 17/18=(33-34)/36= -1/36; 3) -3/7 - 9/14 = (-6-9)/14=-15/14=-1 1/14;4) -5/9 - (-3/4)=-5/9 + 3/4 = (-20+27)/36 = 7/36;5) 3 11/12 - (-4 4/9) =3 11/12 + 4 4/9 =7 + (33+16)/36=7+49/36=8 13/36; 6) 4 5/17 - 6= -1 12/17; 7) 1 3/8 - 3 1/4 = -2 1/4 + 3/8= -2 + (3/8 - 2/8)= -2 + 1/8=-1 7/8;8) -2 14/15 - 1 19/45 = -3 + (-42-19)/45=-3 + (-61/45)= -4 16/45;9) - 3 1/6 - (-1 1/4)=- 3 1/6 + 1 1/4 = -2 1/6 + 1/4 = -2 + (-2+3)/12=-2 + 1/12= -1 11/12.