已知实数xy满足x2y2=9.则y3/x1的取值范围为

若实数x,y满足x2+y2+x2y2-4xy+1=0,则(x+y)2的值为若实数x,y满足x2+y2+x2y2-4xy+1=0,则(x+y)2的值为若实数x,y满足x2+y2+x2y2-4xy+1=0

已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2y2+xy3+y4的值.已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2

已知实数x,y满足x2+y2=2x,求x2y2的范围已知实数x,y满足x2+y2=2x,求x2y2的范围已知实数x,y满足x2+y2=2x,求x2y2的范围∵x^2+y^2=2x∴（x-1)^2+y^

14．已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2y2+xy3+y4的值.已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y

已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y+x2y2+xy3+y4的值.14．已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求x4+x3y

5．实数x,y满足2x+x2+x2y2+2=－2xy,则x+y的值是．实数x,y满足2x+x2+x2y2+2=－2xy,则x+y的值是（）A、－1B、0C、1D、25．实数x,y满足2x+x2+x2y

已知x,y为实数,x2y2+x2+4xy+13=6x,求x,y的值已知x,y为实数,x2y2+x2+4xy+13=6x,求x,y的值已知x,y为实数,x2y2+x2+4xy+13=6x,求x,y的值x

已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求：代数式x4+x3y+x2y2+xy3+y4的值．详细点已知x、y均为实数,且满足xy+x+y=17,x2y+xy2=66,求：代

已知x+y=4,xy=2,则x3y+x2y2+xy3的值:已知x+y=4,xy=2,则x3y+x2y2+xy3的值:已知x+y=4,xy=2,则x3y+x2y2+xy3的值:x+y=4,xy=2后者平

已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值由

已知实数x,y满足x2+y2=1,比较大小：（1-xy)(1+xy）和3/4.我知道了xy小于等于1/2,但是我不明白为什么x2y2小于等于四分之一,万一xy小于0呢?不就不能两边平方了么?已知实数x

已知实数xy满足x+2y已知实数xy满足x+2y已知实数xy满足x+2yz=3x+y=13(x+2y)/6+5(x-4y)/6当x=5,y=2时取到,z最大值17

已知实数xy满足x+y-2已知实数xy满足x+y-2已知实数xy满足x+y-2本题作为选择题,画个图就很明确了.三个不等式确定的x、y的范围是三直线y=-x+2,y=x,x=-3围成的三角形区域.令x

已知实数xy满足a^x已知实数xy满足a^x已知实数xy满足a^x已知实数xy满足a^x则有x>y恒成立x>y

已知实数xy满足x2-x+y=3则x+y的最大值是已知实数xy满足x2-x+y=3则x+y的最大值是已知实数xy满足x2-x+y=3则x+y的最大值是y=-x²+x+3x+y=-x²

已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2=已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2

已知实数xy满足x/y=x-y,且y>1,则实数x的取值范围是已知实数xy满足x/y=x-y,且y>1,则实数x的取值范围是已知实数xy满足x/y=x-y,且y>1,则实数x的取值范围是x>=4x/y

整数x,y满足方程15x2y2=35x2-3y2+412,则有15x2y2=整数x,y满足方程15x2y2=35x2-3y2+412,则有15x2y2=整数x,y满足方程15x2y2=35x2-3y2

已知正实数x,y满足2x+2y+xy=5则xy的取值范围是什么?已知正实数x,y满足2x+2y+xy=5则xy的取值范围是什么?已知正实数x,y满足2x+2y+xy=5则xy的取值范围是什么?由已知x

已知x-y=1/xy=3.求x3次方y-2x2y2+xy3已知x-y=1/xy=3.求x3次方y-2x2y2+xy3已知x-y=1/xy=3.求x3次方y-2x2y2+xy3x3次方y-2x2y2+x