(2/3a^4b^7-1/9a^2b^6)除以(-1/3ab^3)^2=

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(2/3a^4b^7-1/9a^2b^6)除以(-1/3ab^3)^2=
(2/3a^4b^7-1/9a^2b^6)除以(-1/3ab^3)^2=

(2/3a^4b^7-1/9a^2b^6)除以(-1/3ab^3)^2=
(2/3a^4b^7-1/9a^2b^6)除以(-1/3ab^3)^2
=(2/3a^4b^7-1/9a^2b^6)÷(1/9a^2b^6)
=6a^2b-1
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(2/3a^4b^7-1/9a^2b^6)除以(-1/3ab^3)^2
=(2/3a^4b^7-1/9a^2b^6)除以1/9a^2b^6
=2/3a^4b^7除以1/9a^2b^6-1/9a^2b^6除以1/9a^2b^6
=6a^2b-1