Question

Упростите выражения
А) 5а+7b -2а-8b
Б)3•(4x+2)-5
В)20b-(b-3)+(3b-10)

Answer 1

А)
$5a + 7b - 2a - 8b = \\ = 3a - b$
Б)
$3(4x + 2) - 5 = \\ = 12x + 6 - 5 = \\ = 12x + 1$
В)
$20b - (b - 3) + (3b - 10) = \\ = 20b - b + 3 + 3b - 10 = \\ = 22b - 7$