整式的运算:3x²-[7x-(4x-3)-2x²]
问题描述:
整式的运算:3x²-[7x-(4x-3)-2x²]
答
3x²-[7x-(4x-3)-2x²]
=3x²-(7x-4x+3-2x²)
=3x²-3x-3+2x²
=5x²-3x-3