（a눀b）的二分之一次×（ab눀）的负2次÷（ba的﹣2次）的﹣3次=

原式=a√b×(1/a^2b^4)×a^3b^6
=a^2b^2√b

所得税

原式=a√b×(1/a^2b^4)×a^3b^6
=a^2b^2√b .

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