Ответ: 41
Пошаговое объяснение:
4(-2х+5)+Зу-2х = -8x + 20 + 3y - 2x = -10x + 3y + 20 ;
при x = -1 2/5 ; y = 2 1/3.
-10x + 3y + 20 = -10 * (-1 2/5) + 3 * 2 1/3 + 20 = -10 * (-7/5) + 3 * 7/3 + 20 = 14 + 7 + 20 = 41
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Ответ: 41
Пошаговое объяснение:
4(-2х+5)+Зу-2х = -8x + 20 + 3y - 2x = -10x + 3y + 20 ;
при x = -1 2/5 ; y = 2 1/3.
-10x + 3y + 20 = -10 * (-1 2/5) + 3 * 2 1/3 + 20 = -10 * (-7/5) + 3 * 7/3 + 20 = 14 + 7 + 20 = 41