| | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 5 | × | 2 | u | − | 5 | × | 4 | + | 9 | × | 4 | u | − | 9 | × | 9 | = | 46 | u | − | 101 | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
| (2) | | | | | | | | | | | | | | | | | | | | | | | | 5 | ( | 2 | a | − | 10 | b | − | 9 | ) | − | 3 | ( | 8 | a | + | b | + | 3 | ) | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 5 | × | 2 | a | − | 5 | × | 10 | b | − | 5 | × | 9 | − | 3 | × | 8 | a | − | 3 | b | − | 3 | × | 3 | = | −14 | a | − | 53 | b | − | 54 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 5 | × | 2 | u | + | 5 | × | 5 | − | 10 | × | 6 | u | − | 10 | × | 5 | = | −50 | u | − | 25 | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
| (4) | | | | | | | | | | | | | | | | | | | | | | | | | 2 | ( | 6 | x | + | 9 | y | + | 3 | ) | − | 3 | ( | 7 | x | + | 3 | y | + | 7 | ) | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 2 | × | 6 | x | + | 2 | × | 9 | y | + | 2 | × | 3 | − | 3 | × | 7 | x | − | 3 | × | 3 | y | − | 3 | × | 7 | = | −9 | x | + | 9 | y | − | 15 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 9 | × | 4 | x | + | 9 | × | 4 | y | − | 2 | × | 5 | x | − | 2 | × | 6 | y | = | 26 | x | + | 24 | y | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 3 | x | − | 3 | × | 7 | y | + | 10 | × | 3 | x | + | 10 | × | 5 | y | = | 33 | x | + | 29 | y | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | = | 9 | × | 2 | a | + | 9 | × | 4 | b | − | 2 | × | 2 | a | − | 2 | × | 2 | b | = | 14 | a | + | 32 | b | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
|