3x^2-[5x-(2/1x-3)+2x^2]=
问题描述:
3x^2-[5x-(2/1x-3)+2x^2]=
答
=3x^2-(5x-1/2x+3+2x^2)=3x^2-5x+1/2x-3-2x^2=x^2-9/2x-3
答
3x²-[5x-(1/2x-3)+2x²]
=3x²-[5x-1/2 x+3+2x²]
=3x²-(2x²+9/2 x+3)
=3x²-2x²-9/2 x-3
=x²-9/2x-3