摘要：2 2 (3)()2 (4)2 (5)()() (6)(ab-)(ab+) (7) (2a2-3b)(-2a2-3b) (8)()() (9)(-3+2a2)(-3-2a2) (a2+b2) (13)204×196 (14) (15)1032 (16)9982

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