若实数x,y满足2x*X+3y*y=1,S=3x*x-2y*y,则S的取值范围为
若实数x,y满足2x*X+3y*y=1,S=3x*x-2y*y,则S的取值范围为
若实数x、y满足2x^2+3y^2=1,s=3x^2-2y^2,则S的取值范围是
若实数x,y满足2x²+3y²=1,S=3x²-2y²,则S的取值范围是
若实数x,y满足2x²+3y²=1,S=3x²-2y²,则S的取值范围是多少
若实数X Y满足y=2x+1,且x小于等于2y大于等于3,则y/x的取值范围是 ?
已知x,y,z为3个非负实数,且满足3x+2y+z=5,x+y-z=2,若s=2x+y-z求s的取值范围
若实数xy满足4^x+4^y=2^(x+1)+2^(y+1)则s=2^x+2^y的取值范围
若实数xy满足2x²+3y²=1,S=3x²-2y²,则S的取值范围是
已知实数XY 满足方程X^2+Y^2+4X+3=0 则S=(X-1)^2+(Y+3)^2的取值范围
实数X.Y满足X*X+Y*Y-2X-2Y+1=0,则(Y-4)/(X-2)的取值范围是?
已知实数x,y满足{x≧0 y≧x 4x+3y≦12}.z=2y+3/x+1 的取值范围
x,y,z为三个非负有理数,且满足3x+2y+z=5,x+y-z=2,若2x+y-z=s,则s的取值范围是什么?