①若2^x=3,2^y=5,则2^2x-y=?②(-m²n³)^6÷(m²n³)^2=?
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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-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若5x+3y=3x+4y=x+2y+6,则x+y=___
若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2=
若(3x-2y)/(x+y)=2/3,则3x/5y=
若x/y=4/3 则3x+2y/2x-5y=
若x、y互为相反数,且2x-3y=5,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
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若(5x+y)(7x+10y)=1/2,则x/y=______;若x+1/x=3,则x^2+1/x^2
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
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
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
若f(x+y,y/x)=x^2-y^2,则F(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()