1) 640 - x = 100*3y + 350640 - x = 300y + 350x = 640 - 300y - 350x = 290 - 300y
2) a:4 = 450 - 425a/4 = 25a = 4 * 25a = 100
3) b - 280 = 90/3b - 280 = 30b = 280 + 30b = 310
Ответ:1) x = 290 - 300y2) a = 1003) b = 310
1) 640 - x = 100*3y + 350
640 - x = 300y + 350
x = 640 - 300y - 350
x = 290 - 300y
2) a:4 = 450 - 425
a/4 = 25
a = 4 * 25
a = 100
3) b - 280 = 90/3
b - 280 = 30
b = 280 + 30
b = 310
Ответ:
1) x = 290 - 300y
2) a = 100
3) b = 310