∵-3a(a+2b)²-(-3a²)
=-3a(a²+4ab+4b²)+3a²
=-3a³-12a²b-12ab²+3a²
∴-3a²+(-3a³-12a²b-12ab²+3a²)分解因式的结果是-3a(a+2b)²
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