â)ĐK;`x-2>=0`
`<=>x>=2`
c)ĐK:`2017/x>=0(x ne 0)`
Mà `2017>0`
`<=>x>0`
e)ĐK:`x^2+2017>=0`
`<=>x^2>=-2017AAx in RR`
b)ĐK:`2-3x>=0`
`<=>3x<=2`
`<=>x<=2/3`
d)ĐK:`(-2017)/(5-x)>=0(x ne 5)`
`<=>2017/(x-5)>=0`
Mà `2017>0`
`<=>x-5>0<=>x>5`
f)ĐK:`1-x^2>=0`
`<=>x^2<=1`
`<=>-1<=x<=1`