例2、解下列方程 (1)3x(x+2)=5(x+2) (3)(3x+1) 5=0
例2、解下列方程 (1)3x(x + 2) = 5(x + 2) (3)(3 1) 5 0 2 x + − =
°)3x(x+2)=5(x+ 解:移项,得 3x(x+2)-5(x+2)=0 (x+2)(3x-5)=0 x+2=0或3x-5=0 1=-2,X2 53
(1)3x(x + 2) = 5(x + 2) 3x(x + 2) −5(x + 2) 解：移项，得(3x −5) 3 5 = 0 (x + 2) = 0 x+2=0或3x－5=0 ∴ x1=-2 , x2=