y=x,y=-x,y=x+1,y=x-1,y=-x+1,y=-x-1.判断各直线经过哪个象限
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y=x,y=-x,y=x+1,y=x-1,y=-x+1,y=-x-1.判断各直线经过哪个象限
y=x,y=-x,y=x+1,y=x-1,y=-x+1,y=-x-1.判断各直线经过哪个象限
y=x,y=-x,y=x+1,y=x-1,y=-x+1,y=-x-1.判断各直线经过哪个象限
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
y'/y=1/x
化简 x / y(x+y) - y / x(x+y) =
y'-(1/x)y=xe^-x
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
(x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.
2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=2
x>=1,x-y
y=x-1(x
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都是自然数,且x(x-u)-y(y-x)+12,求x.y得值快1且x(x-y)-y(y-x)=12
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
[(y*y*y-y)/(xy+1)*(xy+1)-(x+y)*(x+y)]/[(x+y)*y/(x+1)]其中x=-11,y=1/12,化简再求值.
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=?
y=x(x
y=[x-1],