Odpowiedź:
1.
5(2x - y) - (4x + 3y) = 2(3x - 4y)
10x - 5y - 4x - 3y = 6x - 8y
6x - 8y = 6x - 8y
L = P więc PRAWDA
2.
y(5x²y - 8x) - 4x(10x - 2y) = 5x²(y² + 8x)
5x²y² - 8xy - 40x² + 8xy = 5x²y² + 40x³
5x²y² - 40x² = 5x²y² + 40x³ | : 5
x²y² - 8x² = x²y² + 8x³
x²(y² - 8) = x²(y² + 8x) | : x²
y² - 8 = y² + 8x
y² - y² = 8 + 8x
0 = 8 + 8x
8x = - 8
x = - 8/8 = - 1
Ponieważ x = - 1 więc FAŁSZ
