(3ab-3a的2次方)-5ab-2(3ab-a的2次方)
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(3ab-3a的2次方)-5ab-2(3ab-a的2次方)(3ab-3a的2次方)-5ab-2(3ab-a的2次方)(3ab-3a的2次方)-5ab-2(3ab-a的2次方)(3ab-3a的2次方)-
(3ab-3a的2次方)-5ab-2(3ab-a的2次方)
(3ab-3a的2次方)-5ab-2(3ab-a的2次方)
(3ab-3a的2次方)-5ab-2(3ab-a的2次方)
(3ab-3a的2次方)-5ab-2(3ab-a的2次方)
=3ab-3a^2-5ab-6ab+2a^2
=-8ab-a^2