Пошаговое объяснение:
640 : (2х - 4) = 80
2х - 4 = 640 : 80
2х - 4 = 8
2х = 4 + 8
2х = 12
х = 12 : 2
х = 6
640 : (2 • 6 - 4) = 80
80 = 80
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Пошаговое объяснение:
640 : (2х - 4) = 80
2х - 4 = 640 : 80
2х - 4 = 8
2х = 4 + 8
2х = 12
х = 12 : 2
х = 6
640 : (2 • 6 - 4) = 80
80 = 80