∫（2的x次方乘3的x次方）除（9的x次方减4的x次方）的不定积分=∫(3/2)^x/[(3/2)^2x -1]dx=1/ln(3/2) ∫1/[(3/2)^2x -1]d(3/2)^x=1/ln(3/2)×1/2ln|[(3/2)^x-1]/[(3/2)^x+1]|+c
