若x^2+4y^2=(x+2y)^2+A=(x-2y)^2+B,则A、B个等于多少?
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若集合A={(x,y)|y>=|x-2|} ,B={(x,y)|y
如果A={(x,y)|x,y+2>0},B={(x,y)|2x+3y-6>0},C={(x,y)|x-4
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
y'=(y/x)^2+y/x+4微分方程
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
已知x+y=a,2x-y=-2a,求[(x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值
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若2x-y=a,x+2y=a,则x:y=?
若2x+y+a,x-2y=a,则x/y=?
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
RT,若(√2x-y)+y^2+4y+4=0,求[(x-y)^2+(x+y)(x-y)]÷2x的值
若(x+y)(x-y)^2-xy(x+y)=A(x+y),则A=什么
若m(2x-y^2)=y^4-4x^2,那么代数式m应为( ) A.-2x-y^2 B.-y^2+2x C.2x+y^2 D.2x-y^2
(x-4y)(2x+y)=
已知x/3=y/4=z/6 ,求代数式2x-y+5z/x+3y-z的值已知x+y/x-y等于3,求x+y/x-y-3(x-y)/5(x+y)的值若b/a=3,则代数式3a-b/a的值为