化简求值:(1)已知x+y=6,xy=-2,求(x^4-y^4)÷(x^2+y^2/xy)÷(6x-6y);
化简求值:(1)已知x+y=6,xy=-2,求(x^4-y^4)÷(x^2+y^2/xy)÷(6x-6y);
1.化简求值:(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy
化简求值:已知x+4y=-1,xy=5,求(6xy+7y)+【8x-(5xy-y+6x)】的值
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
先化简再求值(6x√y/x +3/y*√xy^3)-(4x√x/y +√36xy) 已知X=3/2,y=27
当x=-1/3时,【十万火急!】化简求值:(9x^2y-6xy^2)÷(-3xy)-【(4y^2-9x^2)/(-3x+
化简求值:(x+y)(x-y)+(x-y)²-(6x²y-2xy²)÷2y,其中x=-2,
分式的化简求值已知x/y=2求x²-xy+3y²/x²+xy+6y²
先化简,再求值(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2*1/x+y,其中x=-4,y=1
化简求值,若X方-2XY+Y方+1XY-11=0,求X方+6XY+9Y方分之X方-25Y方*5X-25Y分之X+3Y的值
已知;x+y=4,x-y的绝对值=6,求xy(y的平方+y)-y的平方(xy+2x)-3xy
化简求值(x+y)(x-y)-(x-y)²-6x²y/2y+(2xy)²/(-4xy)其中