ДАЮ 30 БАЛЛОВ!!! Разложить на множители 1) 15а^2-13а-20=
2) 15у^2+12ху-8х-10у=
3) 35а+14аb-5b-2b^2=
4) 4x^3-48x^2+5x-60=
5) 35ab-42ac+20b-24c=
6) 3x-6x^2-10xy+5e=
7) 20a^2-a-30=
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