[(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
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[(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
![[(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)](/uploads/image/z/19156088-56-8.jpg?t=%5B%283x%2By%29%E8%99%8F-3%283x-y%29%28x%2By%29-%28x-3y%29%28x%2B3y%29%5D%C3%B7%282xy%29)
原式=(9x²+6xy+y²-9x²-6xy+9y²-x²+9y²)÷2xy
=(19y²-x²)/2xy
=(19y²-x²)/2xy
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
(x+y)(x-y)-(2xy+3y)平方
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)+2x^4y^2÷(xy)^2
[x(x^2 y^2-xy)-y(x^2-x^3y)]÷3x^2y
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
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
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-