* x- rad2<=rad8
x<=2rad2+rad2
x<=3rad2
deci A=(-infinit, 3 rad 2]
* B=(-4,-3)
* C=(-7, +infinit)
* D=[-9,1)
* E=(-infinit, 0)
* F=(-infinit, 8]
* G=[0, + infinit)
* H=(-2,2]
* I=[-11,-6]
