0.1y =2x 5x+y=5
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0.1y=2x5x+y=50.1y=2x5x+y=50.1y=2x5x+y=525x=5x等于五分之一，y等于4y=20x5x+20x=525x=5x=0.2y=20×0.2=4
0.1y =2x 5x+y=5
0.1y =2x 5x+y=5
0.1y =2x 5x+y=5
25x=5
x等于五分之一，y等于4
y=20x
5x+20x=5
25x=5
x=0.2
y=20×0.2=4
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
2(x-y)=5y,x-y=-5
x-y / 5y= (y-x)^2 / ( )
x*x+2x+y*y-4y+5=0 x= y=
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
求(X+Y)(X-Y)(X²+Y²),X=5 Y=2,
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
0.1y=2x,5x+y=5
0.1y =2x 5x+y=5
（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