Докажите неравенства:
а)(a+b)(b+c)(a+c) > 8abc при a>0, b>0, c>0
б)(a+1)(b+1) ≥ 4√(ab) при a>0,b>0
в)√(ab)+√(bc)+√(ac) ≤ a+b+c при a>0,b>0,c>0
4)√((a+b)(c+d)) ≤ 1/2(a+c+b+d) при a>0,b>0,c>0,d>0
Заранее спасибо.
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