| (1) | | | | | | | | | | | | | | | | | | | | | | | | ( | 7 | x | − | 7 | ) | ( | −10 | x | + | 9 | ) | + | 9 | ( | −10 | x | − | 8 | ) | | | | | | | | | | | | | | | | | | | | | | | |
|
| (2) | | | | | | | | | | | | | | | | | | | | | | | | ( | 3 | q | − | 5 | ) | ( | 9 | q | − | 6 | ) | − | 3 | ( | −9 | q | + | 2 | ) | | | | | | | | | | | | | | | | | | | | | | | |
|
| (3) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ( | −9 | w | + | 5 | ) | ( | − | w | − | 6 | ) | + | ( | −7 | w | + | 4 | ) | ( | −10 | w | − | 10 | ) | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
| (4) | | | | | | | | | | | | | | | | | | | | | | | | ( | 7 | b | + | 2 | ) | ( | 8 | b | − | 3 | ) | − | 4 | ( | −9 | b | + | 2 | ) | | | | | | | | | | | | | | | | | | | | | | | |
|
| (5) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ( | −5 | v | + | 1 | ) | ( | 10 | v | − | 4 | ) | + | ( | 4 | v | − | 7 | ) | ( | 8 | v | − | 3 | ) | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
| (6) | | | | | | | | | | | | | | | | | | | | | | | | | ( | c | + | 7 | ) | ( | c | − | 7 | ) | + | ( | c | + | 4 | ) | ( | c | − | 4 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
|
| (7) | | | | | | | | | | | | | | | | | | | | | | | | ( | 3 | a | − | 7 | ) | ( | −7 | a | − | 9 | ) | + | 2 | ( | −9 | a | + | 10 | ) | | | | | | | | | | | | | | | | | | | | | | | |
|