(Bài 2) Tìm x biết a) \( x + \frac{1}{2} = 2,5 \) b) \( x - \frac{1}{3} = \frac{4}{7} \) c) \( x \cdot \frac{4}{9} = \frac{7}{9} \) d) \( x : \frac{3}{2} = 1,5 \)
Bài 3, Tìm x biết a) \( x \cdot \frac{1}{2} + x \cdot (-\frac{3}{4}) = \frac{4}{9} \) b) \( 2x \cdot \frac{1}{4} - 2x \cdot \frac{1}{5} = \frac{4}{3} \) c) \( 3,2 \cdot x + 4,5 \cdot x = \frac{7}{3} \) d) \( 4 \cdot x - 12 = \frac{1}{5} \) e) \( 6x - 5x + 13 = 9x - 11 \)