Question

tìm x : biết

(2x+3)/(5x+2)=(4x+5)/(10x+2)

Answer 1

\(\frac{2x+3}{5x+2}=\frac{4x+5}{10x+2}\)

=> (2x + 3)(10x + 2) = (5x + 2)(4x + 5)

=> 20x² + 4x + 30x + 6 = 20x² + 25x + 8x + 10

=> 34x + 6 = 33x + 10 (bớt 2 vế đi 20x²)

=> x = 4