а) 6а·0,5-3а·2х+2а·7а = 3а-6ах+14а²= 2а(1,5-3х+7а)
б) 8х²-4х+х+1-9 = 8х²-3х-8
в) 13s²-5s+s-9+16= 13s²-4s+7
а) 6а·0,5-3а·2х+2а·7а = 3а-6ах+14а²= 2а(1,5-3х+7а)
б) 8х²-4х+х+1-9 = 8х²-3х-8
в) 13s²-5s+s-9+16= 13s²-4s+7