计算(x+4)·(-2x)-(x+1)(x-1)+(-3x+2)(x+1)； （3x-y)(y+3x)-(4x-3x)(

(x+4)·(-2x)-(x+1)(x-1)+(-3x+2)(x+1)=-2x²-8x-(x²-1)+(-3x²-x+2)=-2x²-8x-x²+1-3x²-x+2=-2x²-x²-3x²-8x-x+2+1=-6x²-9x+3（3x-y)(y+3x)-(4x-3y)(4x+3y)=（3x-y)(3x+y)-(4x-3y)(4x+3y)=9x²-y²-(16x²-9y²)=9x²-y²-16x²+9y²=9x²-16x²+9y²-y²=-7x²+8y²(a+b)(a-b)+a(2b-a)=a²-b²+2ab-a²=a²-a²+2ab-b²=2ab-b²=b(2a-b)=-2*[2*1。5-(-2)]=-2*(3+2)=-2*5=-10