Odpowiedź:
a) 2x(y - 3) - 5(2x + xy) = 2xy - 6x - 10x - 5xy = -16x -3xy =
b) 4x(y - 2) - 2(5x + xy) = 4xy - 8x - 10x - 2xy = -18x +2xy
c) 5(3x - xy) - 2x(y + 3) = 15x - 5xy - 2xy - 6x = 9x -7xy
d) 2(5x - xy) - 3x(y + 2) = 10x - 2xy - 3xy - 6x = 4x -5xy
e) 5a(3 - b) - 3(a + b - ab) = 15a - 5ab - 3a - 3b + 3ab = 12a -3b -2ab
f) 4a(2 - b) - 2(a + b - ab) = 8a - 4ab - 2a - 2b + 2ab = 6a - 2b - 2ab
g) 2a(3 - b) - 3(a - b + ab) = 6a - 2ab - 3a + 3b - 3ab = 3a +3b -5ab
h) 3a(2 - b) - 2(a - b + ab) = 6a - 3ab -2a +2b - 2ab = 4a + 2b - 5ab
i) -3x(-4y) + 5x(-2xy) + 2x² * 3y = 12xy - 10x²y + 6x²y = 12xy - 4x²y
j) 3x(-4y) - 5x(-2xy) - 3x² * 2y = -12xy + 10x²y - 6x²y = -12xy + 4x²y
k) -4x(-3y) + 2x(-5xy) + 2x² * 3y = 12xy - 10x²y + 6x²y = 12xy -4x²y
l) 4x(-3y) - 2x(-5xy) - 3x² * 2y = -12xy + 10x²y - 6x²y = -12xy +4x²y
m) 4ab + (-5a²b) - (-3a²b) = 4ab - 5a²b + 3a²b = 4ab -2a²b
n) 5xy + (-4x²y) - (-6x²y) = 5xy - 4x²y + 6x²y = 5xy + 2x²y
o) 3,5(a² + ab - 4) = 3,5a² +3,5ab -14
p) -6x(x - xy + y) = -6x² + 6x²y - 6xy = -6xy -6x² +6x²y
