(5a+6b-7c)^2-(5a-6b+7c)^2
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(5a+6b-7c)^2-(5a-6b+7c)^2
![(5a+6b-7c)^2-(5a-6b+7c)^2](/uploads/image/z/420354-18-4.jpg?t=%285a%2B6b-7c%29%5E2-%285a-6b%2B7c%29%5E2)
(5a+6b-7c)^2-(5a-6b+7c)^2
=[(5a+6b-7c)-(5a-6b+7c)]×[(5a+6b-7c)+(5a-6b+7c)]
=(12b-14c)×10a
=20a(6b-7c)
=[(5a+6b-7c)-(5a-6b+7c)]×[(5a+6b-7c)+(5a-6b+7c)]
=(12b-14c)×10a
=20a(6b-7c)
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