Odpowiedź:
a)
(1/4x - 5)(1/5x - 4) = [1/4(-20) - 5][1/5 * (-20) - 4] = (-5 - 5)(-4 - 4) = -10 * (-8) = 80
dla x = -20
b)
(x - xy²)/(2y) = (12 - 12*4)/(-4) = (12 - 48)/(-4) = 36/4 = 9
dla x = 12, y = -2
Szczegółowe wyjaśnienie:
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Odpowiedź:
a)
(1/4x - 5)(1/5x - 4) = [1/4(-20) - 5][1/5 * (-20) - 4] = (-5 - 5)(-4 - 4) = -10 * (-8) = 80
dla x = -20
b)
(x - xy²)/(2y) = (12 - 12*4)/(-4) = (12 - 48)/(-4) = 36/4 = 9
dla x = 12, y = -2
Szczegółowe wyjaśnienie: