Представьте в виде квадрата двухчлена и трехчлены.
1) 9y² - 12xy + 4y²;
2) 25t² + 30t + 9;
3) 16k² - 40k + 25;
4) 121a² - 44ac + 4c²;
5) 4n² + 52mn + 169m²;
6) 36t² - 84ts + 49s²;

помогите пожалуйста!!!!!!
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