Ответ:
3а×7b+3a×(-3a) +7b×7b+7b×(-3a) =
=21ab-9a²+49b²-21ab=
=-9ab²+49b²
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Ответ:
3а×7b+3a×(-3a) +7b×7b+7b×(-3a) =
=21ab-9a²+49b²-21ab=
=-9ab²+49b²