Ответ:
6,2ав^2-3а+в-7,2ав^2=в-3а-ав^2=
2-3×(-2,5)-(-2,5)×2^2=2+7,5+10=19,5
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Ответ:
6,2ав^2-3а+в-7,2ав^2=в-3а-ав^2=
2-3×(-2,5)-(-2,5)×2^2=2+7,5+10=19,5