x^2-2xy+y^2=1 2x^2-5xy-3y^2=0
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x^2-2xy+y^2=1 2x^2-5xy-3y^2=0
x^2-2xy+y^2=1 2x^2-5xy-3y^2=0
x^2-2xy+y^2=1 2x^2-5xy-3y^2=0
可以化成(X-Y-1)(X-Y+1)=0和(2X+Y)(X-3Y)=0.前后各有两个XY的表达式,组合一下可以得到四队解(必须一个式子来自前面方程,一个来自后面,不然就错了)
由等式x^2-2xy+y^2=0配方得x=y代入 1 2x^2-5xy-3y^2=0得一个一元二次等式 求得x=y=0
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
.(x+y-2)(x+y-2xy)+(xy-1)^2
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
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+2(xy+y)的值
已知x+y=1,xy=-2,则x²y+xy²-2xy
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4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6
已知x+y=1,xy=1/5,则x^2y=xy^2
若x-y=1,xy=5,则x^2y-xy^2=
(x^2+xy/x-y)/(xy/x-y)计算
5xy平方-2x平方y+[3xy平方-(4xy-2x平方y-2x平方y)],其中x=-2,y=-1求值
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y),其中x=-1/2,y=-5
【数学】已知 1/x-1/y=3 求 5x-xy-5y / x-2xy-y=?已知 1/x=1/y 求 2x-3xy-2y / x-2xy-y=?
已知1/x+1/y=5,求x+y+3xy/2x-4xy+2y的值,已知1/x+1/y=5,x+y+3xy/2x-4xy+2y的值,
(x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1)