数学学霸啊。。。过来过来。。跪求。！ಠ~ಠ
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原式={[a^(4/3)-8a^(1/3)b]/[4b^(2/3)+2a^(1/3)*b^(1/3)+a^(2/3)]}*{a^(1/3)/[a^(1/3)-2b^(1/3)]}*a^(1/3)
=a^(2/3)[a^(4/3)-8a^(1/3)b]/{[4b^(2/3)+2a^(1/3)*b^(1/3)+a^(2/3)][a^(1/3)-2b^(1/3)]}
=a^(2/3)[a^(4/3)-8a^(1/3)b]/{[a^(1/3)]^3-[2b^(1/3)]^3}
=a^(2/3)[a^(4/3)-8a^(1/3)b]/(a-8b)
=(a^2-8ab)/(a-8b)
=a(a-8b)/(a-8b)
=a
=a^(2/3)[a^(4/3)-8a^(1/3)b]/{[4b^(2/3)+2a^(1/3)*b^(1/3)+a^(2/3)][a^(1/3)-2b^(1/3)]}
=a^(2/3)[a^(4/3)-8a^(1/3)b]/{[a^(1/3)]^3-[2b^(1/3)]^3}
=a^(2/3)[a^(4/3)-8a^(1/3)b]/(a-8b)
=(a^2-8ab)/(a-8b)
=a(a-8b)/(a-8b)
=a
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