Odpowiedź:
a) (4a + 3)(b + 5) = 4ab + 20a + 3b + 15
b) (5a - b)(a - 3) = 5a^2 - 15a - ab + 2b
c) (3x - y)(2x + y) = 6x^2 + 3xy - 2xy - y^2 = 6x^2 - y^2 + xy
d) (2xy + 3x)(xy - 2x) = 2x^2y^2 - 4x^2y + 3x^2y - 6x^2 = 2x^2y^2 - x^2y - 6x^2
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Odpowiedź:
a) (4a + 3)(b + 5) = 4ab + 20a + 3b + 15
b) (5a - b)(a - 3) = 5a^2 - 15a - ab + 2b
c) (3x - y)(2x + y) = 6x^2 + 3xy - 2xy - y^2 = 6x^2 - y^2 + xy
d) (2xy + 3x)(xy - 2x) = 2x^2y^2 - 4x^2y + 3x^2y - 6x^2 = 2x^2y^2 - x^2y - 6x^2