x^2-y^2 x^2-2xy+y^2的公因式是 因式分解：-10x^3-6x^2+2x=m(a-b)^3+n(b-a)^2=4x^2-9y^2=(a+b)^2-4(a-b)^2=(a-b)(a^2-ab+b^2)-ab(b-a)=(a-b)(a^2-ab+b^2)+ab(b-a)=(a+b)^2-81(a-b)^2=-a^2-18a-81=-1+81x^4=因式分解(这三到要过程）x(x+y)(x-y)-x(x

(-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) （x^2+xy/x-y)/（xy/x-y)计算 X-Y/2X+2Y XY/X+Y² (x+y)(x-y)-(2xy+3y)平方平方是(2xy+3y)的 因式分解：x×x-xy-2y×y-x-y 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 计算：y/(x的平方-xy)+2/(y-x)-x/(y的平方-xy) 正数x,y满足x-y=2xy,求x-y/x+y的值. 如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值. 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) (x-y)[(x+y)^2-xy]+(x-y)[(x-y)^2+xy] .(x+y-2)(x+y-2xy)+(xy-1)^2 (x^2-xy)y÷y-x/xy怎么做? x的平方+xy-2y的平方-x+y 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy