x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2x^2+3y-xy-3x
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x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2x^2+3y-xy-3xx^2+3y-3xx
x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2x^2+3y-xy-3x
x^2+3y-3x
x^3+2x^2y-9x-18y
(y+2)x^2+(y+2)x-12y-24
m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2
x^2+3y-xy-3x
x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2x^2+3y-xy-3x
第一个不会,你没抄错题?
第二个是(x+2y)(x+3)(x-3)；
第三个是(x+4)(x-3)(y+2)；
第四个是(x+y)(x-y)(m+n)(m-n).
[(x-y)²+（x+y）(x-y)]/2xx=3,y=-1.5
已知x(x-1)-(xx-y)=-3求xx+yy-2xy
已知x（x+1)-(xx+y)=3,求(xx+yy)/2-xy的值
x(x+1)-(xx+y)=-3,求(xx+yy)/2-xy的值
已知xx+yy+4x-6y+13=0,求（xx-2x）/xx+3yy的值.
x+2z =3y 判断xx-9y+4zz+4xz是否是定值
已知14(XX+YY+ZZ)=(X+2Y+3Z)^2,求X:Y:Z
已知式子9-6y-4xX=7,求2XX+3Y+7的值这里XX是X的平方
已知2x=3y,求xy/xx+yy-yy/xx-yy的值
[2x-(x+y)(x-y)](yy-xx)
[(x+2y)^2 -(x+y)(3x-y)-5y^2]÷2xx=-2y=二分之一
2xx+ax-y+6-2bxx+3x-5y-1的值是多少
已知xx+y=5,xy=-3,则x^2y+xy^2=
x^2+3y-3xx^3+2x^2y-9x-18y(y+2)x^2+(y+2)x-12y-24m^2乘x^2+n^2乘y^2-m^2乘y^2-n^2乘x^2x^2+3y-xy-3x
化简(x+y)+(2x+y/1*2)+(3xx+y/2*3)+...+(9x+y/8*9).并求当x=2,y=9时的值
x(x-y)2-(y-x)3
因式分解:2x^3-2x^2-12xx+y-z=1x-2y+z=22x+3y-z=3
求{5x-3y+z= -2 ,5x+2y-4x=3 ,-5x+y-z=2}方程组的解由1+2,得即由2+3,得把xx=XX代入1,得把xx=xx,xx=xx代入1,得所以,原方程的解是