y^2-x^2\5x^2-4yx除以x+y\5x-4y
y^2-x^2\5x^2-4yx除以x+y\5x-4y
已知xy满足x^2+y^2+4/5=2x+y 求代数式yx/x+y的值
合并同类项:6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²
求6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
[(5x+2y)(3x+2y)+(x+2y)(x-2y)]除以4x
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
-x^2y+5xy^2-yx^2合并同类项
6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y,其中|x+3|+(y-2)^2=0
先化简,在求值:6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y 其中|x+3|+(y-1\