1.(2x-3y)(2x+3y)=2.(5x+3y)(3y-5x)3.(x-3y)(-x+3y)=4.(x+y-z)²=
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1.(2x-3y)(2x+3y)=2.(5x+3y)(3y-5x)3.(x-3y)(-x+3y)=4.(x+y-z)²=
1.(2x-3y)(2x+3y)=
2.(5x+3y)(3y-5x)
3.(x-3y)(-x+3y)=
4.(x+y-z)²=
1.(2x-3y)(2x+3y)=2.(5x+3y)(3y-5x)3.(x-3y)(-x+3y)=4.(x+y-z)²=
1.(2x-3y)(2x+3y)=(2x)²-(3y)²=4x²-9y²
2.(5x+3y)(3y-5x)=(3y)²-(5x)²=9y²-25x²
3.(x-3y)(-x+3y)=-(x-3y)²=-x²+6xy-9y²
4.(x+y-z)²=[(x+y)-z]²
=(x+y)²-2(x+y)z+z²
=x²+2xy+y²-2xz-2yz+z²
1、=4x2-9y2
2、=9y2-25x2
3、=-x2+6xy-9y2
4、=x2+xy-xz+xy+y2-yz-xz-yz+z2=x2+y2+z2+2xy-2xz-2yz
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x+y)(2x-3y)=?
结果用幂的形式表示:1.(x-y)^2(y-x)= 2.(x-y)^2(y-)^2= 3.(x-y)^2(y-x)^3= 4.(x-y)^3(y-x)=
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2)/2(x-y)^2
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知x-y=3,求[(x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值
已知3x =2y 求x/x+y+y/x-y-y²/x²-y²
x(x-y)2-(y-x)3
先化简再求值:(x+y)(x-y)+(x^2-2xy+y^2)-(x^2y)^3÷(x^2y)^2,其中x=1,y=2.
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
1.(x+2)^2-(x+y)^32.(x-y)^2-(x-y)^33.(x-y)^2-(y-x)^3
1.(2x-3y)(2x+3y)=2.(5x+3y)(3y-5x)3.(x-3y)(-x+3y)=4.(x+y-z)²=
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简:{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x