(x+2)(3x-2)-5(x+6)(x-6)

问题描述:

(x+2)(3x-2)-5(x+6)(x-6)

(x+2)(3x-2)-5(x+6)(x-6)
=3x^2-2x+6x-4-5(x^2-36)
=3x^2+4x-4-5x^2+180
=-2x^2+4x+176

不懂可追问
满意请采纳
谢谢

=(3x²+4x-4)-5(x²-36)
=3x²+4x-4-5x²+180
=-2x²+4x+176