1) 16
2) x
3) 9y
4) 18x + 7y
Пошаговое объяснение:
1) 4(7 - 5x) - (12 - 20x) = 28 - 20x - 12 + 20x = 28 - 12 = 16
2) 2(3x - y) - (5x - 2y) = 6x - 2y - 5x + 2y = 6x - 5x = x
3) 6(x + 2y) - 3(2x + y) = 6x + 12y - 6x - 3y = 12y - 3y = 9y
4) 4) 5(4x + y) - 2(x - y) = 20x + 5y - 2x + 2y = 18x + 7y
1) 16
2) x
3) 9y
4) 18x + 7y
Пошаговое объяснение:
1) 4(7 - 5x) - (12 - 20x) = 28 - 20x - 12 + 20x = 28 - 12 = 16
2) 2(3x - y) - (5x - 2y) = 6x - 2y - 5x + 2y = 6x - 5x = x
3) 6(x + 2y) - 3(2x + y) = 6x + 12y - 6x - 3y = 12y - 3y = 9y
4) 4) 5(4x + y) - 2(x - y) = 20x + 5y - 2x + 2y = 18x + 7y