f(x)=lnx+2^xx>0f`(x)=1/x+2^xln2>0∴f(x)为增函数f(x^2+2)>f(3x)x^2+2>03x>0 x>0x^2+2>3xx²-3x+2>0(x-1)(x-2)>0x>2 or x