3(-4x+y)(x-y)+2(3x-2y)(x+3y)=3(-4x²+5xy-y²)+2(3x²+7xy-6y²)=-12x²+15xy-3y²+6x²+15xy-12y²=-6x²+30xy-15y²=-6×(-2)²+30×(-2)×1-15×1²=-24-60-15=-99 明白请采纳,有疑问请追问!有新问题请求助,谢谢!