4(a+b)(a+b)(a-b)(a-b)=?(已知(aa-bb)=9)答案

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4(a+b)(a+b)(a-b)(a-b)=?(已知(aa-bb)=9)答案
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4(a+b)(a+b)(a-b)(a-b)=?(已知(aa-bb)=9)答案
4(a+b)(a+b)(a-b)(a-b)=?(已知(aa-bb)=9)答案

4(a+b)(a+b)(a-b)(a-b)=?(已知(aa-bb)=9)答案
4(a+b)(a+b)(a-b)(a-b)
=[2(a+b)(a-b)]^2
=[2(a^2-b^2)]^2
=18^2
=324

4(a+b)(a+b)(a-b)(a-b)
=4*(aa-bb)(aa-bb)
=4*9*9
=324

=4*[(A+B)(A-B)][(A+B)(A-B)]
=4*[AA-BB][AA-BB]
=4*9*9
=4*81
324