求一二题的解题过程和答案。
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(1)
1<|x-3|≤3
|x-3|≤3 (1) and
|x-3| >1
from (1)
|x-3|≤3
-3≤x-3≤3
0≤x≤6 (3)
from (2)
|x-3| >1
x-3 >1 or x-3<-1
x>4 or x<2 (4)
1<|x-3|≤3
(3) and (4)
0≤x≤6 and "x>4 or x<2"
0≤x<2 or 4<x≤6
(2)
x^2-ax-b<0
=> 2<x<3
=> a>0
x1+x2 = a
2+3=a
a=5
x1.x2 = -b
2*3=-b
b=-6
bx^2-ax-1>0
-6x^2-5x-1>0
6x^2+5x+1<0
(2x+1)(3x+1)<0
-1/2<x<-1/3
1<|x-3|≤3
|x-3|≤3 (1) and
|x-3| >1
from (1)
|x-3|≤3
-3≤x-3≤3
0≤x≤6 (3)
from (2)
|x-3| >1
x-3 >1 or x-3<-1
x>4 or x<2 (4)
1<|x-3|≤3
(3) and (4)
0≤x≤6 and "x>4 or x<2"
0≤x<2 or 4<x≤6
(2)
x^2-ax-b<0
=> 2<x<3
=> a>0
x1+x2 = a
2+3=a
a=5
x1.x2 = -b
2*3=-b
b=-6
bx^2-ax-1>0
-6x^2-5x-1>0
6x^2+5x+1<0
(2x+1)(3x+1)<0
-1/2<x<-1/3
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大神英语学的真好
能不能再帮帮我,我是个学渣。
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