计算(5x+2)(x-1)-(2x-3)²

问题描述:

计算(5x+2)(x-1)-(2x-3)²

原式=(5x²-5x+2x-2)-(4x²-12x+9)
=5x²-3x-2-4x²+12x-9
=x²-15x-11

(5x+2)(x-1)-(2x-3)²
=5x^2-3x-2-4x^2+12x-9
=x^2+9x-11