问题补充:
设实数x,y满足0<xy<1且0<x+y<1+xy,那么x,y的取值范围是
答案:
答案:分析:x+y<1+xy,x-xy+y-1<0⇒x(1-y)+y-1<0⇒(x-1)(1-y)<0⇒(x-1)(y-1)>0⇒x>1,y>1或x<1,y<1,由0<xy<1,所以,0<x<1,0<y<1.
时间:2021-12-20 20:07:17
设实数x,y满足0<xy<1且0<x+y<1+xy,那么x,y的取值范围是
答案:分析:x+y<1+xy,x-xy+y-1<0⇒x(1-y)+y-1<0⇒(x-1)(1-y)<0⇒(x-1)(y-1)>0⇒x>1,y>1或x<1,y<1,由0<xy<1,所以,0<x<1,0<y<1.
单选题若实数x y z满足x2+y2+z2=1 则xy+yz+zx的取值范围是A.[-
2022-01-02
单选题设b≥a>0 实数x y满足 则的取值范围是A.B.C.D.
2019-10-29