-1+5/7= -2/7
-2+3/4=-1целая1/4
3-1/7= 2 целых 6/7
1-2/7=5/7
-2-1/7= -2 целых 1/7
-5-2 целых 3/7= -7 целых 3/7
542
379
___
911 ..............
1) x + 5 = 0
x = -5
2) x + 7 = 5 + x + 2
7 = 7
3) (x+3) - (x - 2) = 0
1 = 0 - не верно
1) m×3 = 7020-4080= 2940 m×3 = 2940 2940 ÷3=980 m=980 2) n÷7 = 6000-1275 =4725 n÷7= 4726 n = 4725×7=33075 n = 33075 3) k×6= 5456+2284 k×6=7740 k= 7740÷6=1290 k= 1290 4) 2160÷u 5000-4996 2160÷u=4 u= 2160 ÷4 =540 u = 540