以例说明：2^(x/2)=8  ->   2^(x/2)=2^3   ->   x/2=3  ->   x=6 ；a^(1/x)=b  ->    (1/x) lga=lgb  ->&nb...k. 12x^（-2/5）-3 = 0就比如这个？12x^(-2/5)=34/x^(2/5)=1x^(2/5)=4(x^2)^(1/5)=4x^2=4^5x^2=2^10x = ±2^5 = ±32