已知XY 满足log(X)Y+4log(Y)X-4=0,求X+Y的取值范围..
已知log的2次方【log的3次方(log的4次方x)】=log【log的4次方(log的2次方y】=0,求x+y的值
已知log(2)[log(3)(log(4) x)] = log(3) [log(4) (log(2) y)]=0,求x
已知实数x,y满足x²+4y²=4x,求x+y的取值范围
已知实数XY满足X^2+Y^2+4X+3=0,求Y-2/X-1的取值范围
已知关于xy方程组3x+2y=a;2x+3y=4的解满足x>y,求a的取值范围
已知实数x,y满足x^2+y^2=4,求下列各式的取值范围:(1)3x+4y.(2)xy
已知xy满足-2小于等于x+y小于等于4,0 小于等于2x-y小于8 ,求x,y的取值范围
已知实数x,y满足x2+y2=4,求x+y的取值范围
已知实数x,y满足x²+2xy-1=0,求x+y的取值范围.当0≤x≤4时,求y=根号x-x的最大值和最小值.
已知实数x,y满足x2+y2-4x+1=0,求2x+y的取值范围?
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知实数xy满足(x∧2/4)+(y∧2/16)=1,求x+y的取值范围