[x+2]+[x-3}<7
[x-3]+[x+1]>6
[x-3]+[x-2]>7求x的范围,咋求嘛?详细解析下,并附上答案
[x+2]+[x-3}<7
[x-3]+[x+1]>6
[x-3]+[x-2]>7求x的范围,咋求嘛?详细解析下,并附上答案
x>3,化简x+2+x-3<7 x<4------ 3<x<4
-2<=x<=3 化简x+2+3-x<7 5<7 ----- -2<=x<=3
x<-2 化简-x-2+3-x<7 x>-3----- -3<x<-2
综上所述-3<x<4
|x-3]+[x+1]>6
x>3化简,x-3+x+1>6 x>2 ---x>3
x<-1化简,3-x-x-1>6 x<-2 ----x<-2
-1<=x<=3化简3-x+x+1>6 4>6 无解
x>3 x<-2
[x-3]+[x-2]>7
x>3 化简x-3+x-2>7 x>6---- x>6
x<2化简3-x+2-x>7 x<-1----- x<-1
2<=x<=3化简 3-x+x+2>7 5>7无解
x>6 x<-1
(1)2x-1<7
x<3
(2)2x-2>6
x>2
(3)2x-5>7
x>6