若x=1,y=-1 x=2,y=2 x=3,y=c都是方程ax+by+2=0的解,则c等于什么
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若x=1,y=-1 x=2,y=2 x=3,y=c都是方程ax+by+2=0的解,则c等于什么
若x=1,y=-1 x=2,y=2 x=3,y=c都是方程ax+by+2=0的解,则c等于什么
若x=1,y=-1 x=2,y=2 x=3,y=c都是方程ax+by+2=0的解,则c等于什么
x=1,y=-1 x=2,y=2代入方程 求得a=-3/2 b=1/2 把x=3方程代入方程 c=5
已知x=1①y=﹣1②和x=2,y=2都是方程ax﹢by﹢2=0的解所以a=0.5 b=-1.5把x=3①,代入方程0.5x-1.5y+2=0 y=5
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若x*x+y*y=x+y-1/2,求x,y的值如题
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
(x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.
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x+2y=2x+y+1=7x-y 求:2x-y?
设x,y满足约束条件x+y>=1,x-y>=-1,2x-y
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二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
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(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)