c: =>2x^3+4x^2+3x^2+6x+x+2=0
=>(x+2)(2x^2+3x+1)=0
=>(x+2)(x+1)(2x+1)=0
=>\(x\in\left\{-1;-2;-\dfrac{1}{2}\right\}\)
d: =>2x^3-4x^2+4x^2-8x-x+2=0
=>(x-2)(2x^2+4x-1)=0
=>\(x\in\left\{2;\dfrac{-2\pm\sqrt{6}}{2}\right\}\)
e: =>4x^2(2x-1)+5(2x-1)=0
=>2x-1=0
=>x=1/2
h: =>(3x-3)^2=(x+1)^2
=>(3x-3-x-1)(3x-3+x+1)=0
=>(2x-4)(4x-2)=0
=>x=1/2 hoặc x=2