-8(2x-y)-{7x-[6x+2y-(10x-8y)]}

-6x-y-7x+6x-2y-10x+8y+x+6x-8y的值 -8(2x-y)-{7x-[6x+2y-(10x-8y)]} x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= (x-y)^2+7(x+y)-11(x-y)^2-8(x+y),先化简.再求值 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y( 因式分解:8(x-2y)-x(7x+y)+xy. 2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X 化简求值 -3(2x-y)-｛7x-〔6x+2x-(10x-8y)〕-x-2(3x-4y)｝ 计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8 y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1