解道数学题( 急)
化简[8ab^(1/3)-b^(4/3)]/[4a^(2/3)+2(ab)^(1/3)+b^(2/3)]÷[2(a/b)^(1/3)-1]×b^(1/3)要详细过程...
化简 [8ab^(1/3)-b^(4/3)]/[4a^(2/3)+2(ab)^(1/3)+b^(2/3)]÷[2(a/b)^(1/3)-1]×b^(1/3)
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原式=[8ab^(1/3)-b^(4/3)]/[4a^(2/3)+2(ab)^(1/3)+b^(2/3)]/[2(a/b)^(1/3)-1]*b^(1/3)
=[(8a-b)*b*b^(2/3)]/{[4a^(2/3)+2(ab)^(1/3)+b^(2/3)]*[2a^(1/3)*b^(2/3)-b]}
=[(8a-b)*b*b^(2/3)]/[8ab^(2/3)+4ba^(2/3)+2b*(ab)^(1/3)-4ba^(2/3)-2b*(ab)^(1/3)- b*b^(2/3)]
=[(8a-b)*b*b^(2/3)/[(8a-b)*b^(2/3)]
=b
=[(8a-b)*b*b^(2/3)]/{[4a^(2/3)+2(ab)^(1/3)+b^(2/3)]*[2a^(1/3)*b^(2/3)-b]}
=[(8a-b)*b*b^(2/3)]/[8ab^(2/3)+4ba^(2/3)+2b*(ab)^(1/3)-4ba^(2/3)-2b*(ab)^(1/3)- b*b^(2/3)]
=[(8a-b)*b*b^(2/3)/[(8a-b)*b^(2/3)]
=b
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