1.Разложите на множители квадратный трехчлен:

а) х^2-10х+21;

б) 5у^2+9у-2.

В) 2x^2-x-1

г) -2x^2+4x+6

д) 6x^2-18x+12

2. Сократите дробь
а) 7x-2+4^2 / 1 -16x^2
б) 2x^2-5x-3 / x^2+x-6
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