(a²-b²)²+3(a²-b²)-18

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(a²-b²)²+3(a²-b²)-18
(a²-b²)²+3(a²-b²)-18

(a²-b²)²+3(a²-b²)-18
是要因式分解么?
=(a²-b²+6)(a²-b²-3)