Đáp án:
Câu 1:
a) 4x - 2 = 0
⇔ 4x = 2
⇔ x = $\frac{1}{2}$
b) 8x + 4 = 0
⇔ 8x = -4
⇔ x = $\frac{-1}{2}$
c) 7x - 3 = 2x + 2
⇔ 7x - 2x = 2 + 3
⇔ 5x = 5
⇔ x = 1
d) 10x + 1 = 20x + 41
⇔ 10x - 20x = 41 - 1
⇔ -10x = 40
⇔ x = -4
e) $\frac{4}{3}$x - $\frac{5}{6}$ = $\frac{1}{2}$
⇔ $\frac{4}{3}$x = $\frac{4}{3}$
⇔ x = 1
f) $\frac{-5}{9}$x + 1 = $\frac{2}{3}$x - 10
⇔ $\frac{-5}{9}$x - $\frac{2}{3}$x = -10 - 1
⇔ $\frac{-11}{9}$x = -11
⇔ x = 9