y=(3x-1)/(x+1) (x>=5)值域 y=x-√(1-2x)值域
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(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
函数,y=3x/(x^2+x+1) ,x
函数y=3x/(x^2+x+1) (x
y=3x/x²+x+1(x
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
y=3x-1/x+1(x>=5)
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
xy²/(x²y-y) × x²/(x²+x)=(x²-3x)/(x²-5x) × 2x-10/(x²-6x+9)=化简求植x²-1/(x²-x-2)除以x/2x-4,其中x=1/2[x-x/(x+1)]除以[x/(2x-4)] ,其中x=√2+1
高数求极限 y=[(3^x +4^x +5^x)/3]^(1/x) (x->0)
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
x=3,y=-x+5(x>1) y=-x+5(x≤1),y=?
化简 求值 x-{-5x-[-y+(-x+3y)+x]},其中x=-1,y=-2;