-21a^2b^3+6a^3b^2-3a^2b'因式分解

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-21a^2b^3+6a^3b^2-3a^2b''因式分解-21a^2b^3+6a^3b^2-3a^2b''因式分解-21a^2b^3+6a^3b^2-3a^2b''因式分解-21a^2b^3+6a^3b^

-21a^2b^3+6a^3b^2-3a^2b'因式分解
-21a^2b^3+6a^3b^2-3a^2b'
因式分解

-21a^2b^3+6a^3b^2-3a^2b'因式分解
-21a^2b^3+6a^3b^2-3a^2b
=-3a^2b(7b²-2ab+1)
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