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10.01.2021 •
Mathematics
Please help, Look at the picture
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Ответ:
the first one?
Step-by-step explanation:
I am like 67% sure.
Ответ:
= (7a)^2 + (-2b)^2 + (-3c)^2 + (2*7a*-2b) + (2*-2b*-3c) + (2*-3c*7a)
=(7a - 2b - 3c)^2 (Answer)