3x-5y=12
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(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
填空题 x+y/4=x-y/6=3x+12y+5/8 x= y=
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
2(x-2y)²-7(x-2y)³+3(2y-x)²+(2y-x)³合并同类项 这个式子2(x-2y)²-7(x-2y)³+3(2y-x)²-(2y-x)³=2(x-2y)²-7(x-2y)³+3(x-2y)²+(x-2y)³=5(x-2y)²-6(x-2y)³=(x-2y)²(5-6x+12y)
3x—y=5 ,5x+2y=12 ,x=?y=?
4(x+2)=1-5y 4(x+y)-3(x-y)=12
3y+12=x 4y+5=x ,求x,y
5x+y=12 x-3y=4 求x和y
已知关于x、y的方程组3x+5y=4 5x+3y=12 求x+y与x-y的值.
若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y=
(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1,
y=3x y和( )成正比例?x=y/5 y和x成( )比例?y=12/x y和x成(y=3x y和( )成正比例?x=y/5 y和x成( )比例?y=12/x y和x成( )比例?
12y(x-y)^2-8(x-y)^3=?
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11