1) -2/7 + 5/6 = -12/42 + 35/42 = (35 - 12)/42 = 23/42
2) -23 1/2 + 8 7/8 = -47/2 + 71/8 = -188/8 + 71/8 = -117/8 = -14 5/8
5) Подставляем x = -18,1: -18,1 + (-6,3) = -24,4Подставляем x = 3/8: 3/8 + (-6,3) = -6
6) -5 1/9 + 6,4 - 2 5/7 + 1 2/3 = -46/9 + 64/10 - 19/7 + 8/3 = -20/9 + 32/9 - 27/9 + 24/9 = 9/9 = 1
1) -2/7 + 5/6 = -12/42 + 35/42 = (35 - 12)/42 = 23/42
2) -23 1/2 + 8 7/8 = -47/2 + 71/8 = -188/8 + 71/8 = -117/8 = -14 5/8
5) Подставляем x = -18,1: -18,1 + (-6,3) = -24,4
Подставляем x = 3/8: 3/8 + (-6,3) = -6
6) -5 1/9 + 6,4 - 2 5/7 + 1 2/3 = -46/9 + 64/10 - 19/7 + 8/3 = -20/9 + 32/9 - 27/9 + 24/9 = 9/9 = 1