√a^2n*b^3-a^n*b√b
=(a^1/2)^2n*b^3-a^n*b*b^1/2
={[a^1/2]^2}^n*b^3-a^n*b*b^1/2
=a^n*b^3-a^nb^3/2
=a^nb^3/2(b^3/2-1)㊣㊪
不好意思没说清楚前面的根号是包括整的根号下a^2n*b^3
a^2n*b^3/2-a^n*b√b
=(a^1/2)^2n*b^3/2-a^n*b*b^1/2
={[a^1/2]^2}^n*b^3/2-a^n*b*b^1/2
=a^n*b^3/2-a^nb^3/2
=0
那就简单多了!