397. Упростите:
1) (с – 3) - (c + 3) (3 – с);
2) (а+2)²- (a+ 2) (2 - а);
3) (2x+3y) (2x – 3y) + (2x+3y) ;
4) (За – 4b) (За + 4b) - (3а – 4b)²;
5) (-b-a) (a+b) + a²+ b²
6) (b – a) (-a – b) + 2b².
пожалуйства помогите
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