27 : а =5 + 4
27 : а =9
а =27 :9
а=3
100 – y = 17 + 64
– y = 64 + 17 – 100
-y = -19
y = 19
а × 8 = 15 + 9
а × 8 = 24
а = 24/8
27 : а =5 + 4
27 : а =9
а =27 :9
а=3
100 – y = 17 + 64
– y = 64 + 17 – 100
-y = -19
y = 19
а × 8 = 15 + 9
а × 8 = 24
а = 24/8
а=3