Выполни сложение

1. \(10 + (4 + 3) = 10 +\) [ ] \(=\) [ ]
2. \((10 + 4) + 3 = \) [ ] \(+ 3 = \) [ ]
3. \(2+(12+4)=2+\) [ ] \(=\) [ ]
4. \((20 + 3) + 4 =\) [ ] \(+ 4 =\) [ ]
5. \(3+(10+2)=\) [ ]
6. \((3 + 10) +2=\) [ ]