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3A+6B =3(2X^2+3XY-2X-1)+6(-X^2+XY-1) =6x^2+9xy-6x-3-6x^2+6xy-6 =15xy-6x-9 =x(15y-6)-9 與x無關 則x前係數=0 15y-6=0 y=2/5
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