Ответ:
a) 49x^2 -42xy +9y^2
b) 25m^2 + 40mn +16n^2
c) (5a-8b)(5a+8b)
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Ответ:
a) 49x^2 -42xy +9y^2
b) 25m^2 + 40mn +16n^2
c) (5a-8b)(5a+8b)
Ответ:
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