Преобразуйте выражения в многочлен (7 класс)
1. a²+(3a-b)
2.9b²-(a-3b)
3. (5+y)²+y(y-7)
4.a(4-a)+(4-a)²
5. 2(a-b)²
6.a (1+2a)²
Помогите пожалуйста!!!
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