Odpowiedź:
a)
(5 + 3a)(4 + b) = 20 + 5b + 12a + 3ab
b)
(b - 2a)(5 - 3b) = 5b - 3b² - 10a + 6ab
c)
(y - x)(5x + 2y) = 5xy + 2y² - 5x² - 2xy = -5x² + 2y² + 3xy
d)
(xy - x)(2xy + 3x) = 2x²y² + 3x²y - 2x²y - 3x² = 2x²y² + x²y - 3x²
Szczegółowe wyjaśnienie:
a) (5 + 3a)(4 + b) = 20 + 5b +12a+ 3ab
b) (b - 2a)(5 - 3b) = 5b -3b² -10a + 6ab
c) (y - x)(5x + 2y) = 5xy +2y² - 5x² - 2xy = 3xy + 2y² -5x²
d) (xy - x)(2xy + 3x) = 2x²y²+3x²y-2x²y-3x² = 2x²y² + x²y - 3x²
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Odpowiedź:
a)
(5 + 3a)(4 + b) = 20 + 5b + 12a + 3ab
b)
(b - 2a)(5 - 3b) = 5b - 3b² - 10a + 6ab
c)
(y - x)(5x + 2y) = 5xy + 2y² - 5x² - 2xy = -5x² + 2y² + 3xy
d)
(xy - x)(2xy + 3x) = 2x²y² + 3x²y - 2x²y - 3x² = 2x²y² + x²y - 3x²
Szczegółowe wyjaśnienie:
Odpowiedź:
a) (5 + 3a)(4 + b) = 20 + 5b +12a+ 3ab
b) (b - 2a)(5 - 3b) = 5b -3b² -10a + 6ab
c) (y - x)(5x + 2y) = 5xy +2y² - 5x² - 2xy = 3xy + 2y² -5x²
d) (xy - x)(2xy + 3x) = 2x²y²+3x²y-2x²y-3x² = 2x²y² + x²y - 3x²
Szczegółowe wyjaśnienie: