2/3≤u≤6
实数x,y满足x²+xy+y²记u=x²-xy+y²,则u的取值范围是
1个回答
相关问题
-
实数x、y满足x^2;+xy+y^2;=2,记u=x^;-xy+y^2;,则u的取值范围是yiz
-
设实数xy满足x+y-3≤0,y-x/2≥0,x-1≥0,则求u=y/x-x/y的取值范围
-
已知x>0,y>0,且x+y=xy,则u=x+4y的取值范围是 ______.
-
实数xy满足x2—2x—4y=5,记t=x-2y,则t的取值范围
-
设实数x,y满足x^2+xy+y^2=1,则x+y的取值范围
-
若实数xy满足(x+y)的平方+(x+y)-2=0则x+u的值
-
.设实数x、y满足x +2xy-1=0,则x+y的取值范围是
-
实数x,y满足x^2+y^2=1,则2xy/(x+y-1)的取值范围
-
已知正实数x,y满足2x+2y+xy=5 则xy的取值范围是什么?
-
设实数x,y满足x2+2xy-1=0,则x+y的取值范围是______.