1.若实数a,b满足a+b=2,则3^a+3^b的最小值是多少?2.设a1 a2 a3 a4成等比数列,其公比为2,则2a3+a4分之2a1+a2的值?3.若x>0,y>0,且x分之2+y分之8=1,则X最小值为?4.点(x,y)在直线x+3y-2=0上,则3^x+27^Y+3的最小值为?5.

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