化简2（2X-7Y)(7Y+2X)+X^2-(-4X+5Y)(-5Y-4X)

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/10 15:21:16

2（2X-7Y)(7Y+2X)+X^2-(-4X+5Y)(-5Y-4X)
=2（4X^2-49Y^2)+X^2-(16X^2-25Y^2)
=8X^2-98Y^2+X^2-16X^2+25Y^2
=-7X^2-73Y^2

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) x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8 化简2（2X-7Y)(7Y+2X)+X^2-(-4X+5Y)(-5Y-4X) 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 化简：（2x-y)²-4(x-y)(x+y) 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 5(2x-7y)-(4x-10y)全过程 x^2-y^2/x+y-4x(x-y)+y^2/2x-y, 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7