Вопрос школьника по предмету Алгебра
25х^2-4а^2+12ав-9в^2.
Разложить на умножаемые.
Ответ учителя по предмету Алгебра
1) — 4a^2 + 12aв — 9в^2 = — ( 2а — 3в )^2
2) 25х^2 = ( 5х )^2
3) ( 5х )^2 — ( 2а — 3в )^2 = ( 5х + 2а — 3в )( 5х — 2а + 3в )
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