计算(9a^2b^3-12a^4b^3)/(-3a^2b)+(a^2b-b)*(-3b)

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计算(9a^2b^3-12a^4b^3)/(-3a^2b)+(a^2b-b)*(-3b)

计算(9a^2b^3-12a^4b^3)/(-3a^2b)+(a^2b-b)*(-3b)
计算(9a^2b^3-12a^4b^3)/(-3a^2b)+(a^2b-b)*(-3b)

计算(9a^2b^3-12a^4b^3)/(-3a^2b)+(a^2b-b)*(-3b)
(9a^2b^3-12a^4b^3)/(-3a^2b)+(a^2b-b)*(-3b)
=3a²b(3b²-4a²b²)/(-3a²b) - 3b²( a²-1)
=-(3b²-4a²b²) - 3b²( a²-1)
=b²(4a²-3) -b²(3a²-3)
=b²(4a²-3-3a²+3)
=a²b²