Use the above formulae to fill proper terms in the following boxes.
1. (x + 2y)2 = x2 + ___ + 4y2
2. (2x – 5y)2 = __ – 20xy + __
3. (101)2 = (100 + 1)2 = ___+ ___ + 12 = ___
4. (98)2 = (100 – 2)2 = 10000 – ___ + ___ = ___
5. (5m + 3n) (5m – 3n) = ___ – ___ = ___ - ___