Question

Tìm x € N, biết :

a . (2x - 4) x 2 = 2 mũ 2.

b . 8x + 56 : 14 = 60

Answer 1

a)

(2x - 4) * 2 = 2 mũ 2

(2x - 4) * 2 = 4

(2x - 4) = 4 / 2

2x - 4 = 2

2x = 2+4

2x = 6

x = 6/2

x= 3