-9a^3+12a^2b-6ab^2

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-9a^3+12a^2b-6ab^2-9a^3+12a^2b-6ab^2-9a^3+12a^2b-6ab^2解-9a³+12a²b-6ab²=-3a(3a²-4

-9a^3+12a^2b-6ab^2
-9a^3+12a^2b-6ab^2

-9a^3+12a^2b-6ab^2
解
-9a³+12a²b-6ab²
=-3a(3a²-4ab+2b²)
=-3a(3a-b)(a-b)

原式=-3a(3a^2-4ab+2b^2)