Выполни задание

Заполни пустые клетки.

1. \(x^2-6x+\) [ ] \(=(x-\) [ ] \()^2\) ;

2. \(x^2+2\cdot\) [ ] \(\cdot x+\) [ ] \(=(x+5)^2\) ;

3. \(4x^2+8x+\) [ ] \(=(\) [ ] \(+\) [ ] \()^2\) ;

4. \(\dfrac{1}{9}x^2-2x+\) [ ] \(=(\) [ ] \(-\) [ ] \()^2\) .