5+3x/5-2x的2/3x次方
= [1+ 1/(1/x-2/5)] ^(2/3x)
= e^(2/3)
x的三次方+1/x的三次方-1的2x-x³:次方
= [1+ 2/(x³-1)] ^(2x-x³)
= e^(-2 )