问题 填空题

计算(-3a2+2b2)(3a2-2b2)=______.

答案

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

=-(3a2-2b2)(3a2-2b2

=-(3a2-2b22

=-(9a4-12a2b2+4b4

=-9a4+12a2b2-4b4

故答案为-9a4+12a2b2-4b4

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