①若2^x=3,2^y=5,则2^2x-y=?②（-m²n³）^6÷（m²n³）^2=?

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（）