1. Преобразуйте в многочлен: a) (2a- 1)2; б) (x+ 3y)2; в) (7-x)(7+x). 2. Упростите выражение: a) (x+5)2 -5x(2-x); б) 16у +2(у-4)2. 3. Разложите на множители: a) 81 - a2; б) 5x2- 5y2; в) 3x2 -6xy+ 3y2.​
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