3x²-[5x-(1/2x-3)+2x²]怎样去括号?

问题描述:

3x²-[5x-(1/2x-3)+2x²]怎样去括号?

3x²-[5x-(1/2x-3)+2x²]
=3x²-(5x-1/2x+3+2x²)
=3x²-5x+1/2x-3-2x²
=x²-9/2x-3