若x-2y=7,x+2y=5.则x^2-4y^2的值是 .另有一题.已知x+1/x=3,则x^2+1/x^2= .
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若f(x+y,y/x)=x^2-y^2,则F(X,Y)=
若2x=3y,则(x*x+y*y)/x*x=?
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若x^2-y^2=28,x+y=7,则x-y=
若x+3y=3x+2y=7,则x+y=几?
若5x+y/7x+10y=1/2,则x/y=?
若7x+10y分之5x+y=1/2,则x/y=
若(5x+y)/(7x+10y)=1/2则x/y=
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=
若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x=
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若x+2y分之x-y=3,则代数式x+2y分之2(x-y)-3(x-y)分之x+2y的值为
已知方程组{(X+Y)-3(X-Y)=7,2(X+Y)+(X-Y)=-7}则(X+Y)(X-Y)=
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
x+2y=2x+y+1=7x-y 求:2x-y?