1) y + 8/15 = 0.8y = 0.8 - 8/15y = 12/15 - 8/15y = 4/15
Ответ: y = 4/15
2) (x - 0.4) - 3/40 = 7/25x - 0.4 = 7/25 + 3/40x - 0.4 = 112/100 + 75/100x - 0.4 = 187/100x = 187/100 + 40/100x = 227/100
Ответ: x = 227/100
1) y + 8/15 = 0.8
y = 0.8 - 8/15
y = 12/15 - 8/15
y = 4/15
Ответ: y = 4/15
2) (x - 0.4) - 3/40 = 7/25
x - 0.4 = 7/25 + 3/40
x - 0.4 = 112/100 + 75/100
x - 0.4 = 187/100
x = 187/100 + 40/100
x = 227/100
Ответ: x = 227/100