(-6 3/4 + 5 1/8) : (-1,3) = 1 целая 1/4
1) - 6 3/4 + 5 1/8 = - 6 6/8 + 5 1/8 = - 1 целая 5/8 = - 13/8
2) - 13/8 : (-1,3) = 13/8 : 13/10 = 13/8 * 10/13 = 10/8 = 1 2/8 = 1 1/4
Пояснения:
3/4 = 6/8 - доп.множ. 2
1 целая 5/8 = (1*8+5)/8 = 13/8
1,3 = 1 целая 3/10 = (1*10+3)/10 = 13/10
2/8 = 1/4 - сократили на 2
(-) : (-) = (+)