3X+8Y=51 X+6Y=21 问X=?Y=?
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3X+8Y=51 X+6Y=21 问X=?Y=?
已知x-y=3,x+y=8,问x^2 -y^2=?
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
7x+6y=21 3x+4y=12 问x和y是多少?
x@y=(x+y)除以2,X#Y=3X-Y除以2 问:(9@x)#30=6,求x的值.
8x+10y=1252 x+y=143 问x=?y=?
x+y=3,xy=1,问:y分之x+x分之y=
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=?
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
2x+y=17,x-2y=1问x=多少.3x+2y=8,6x+3y=15问x=多少
(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
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20