x | -4 | -3 | -2 | -1 | 0 | 1 | 2 | 3 | 4 |
|x-1| | |||||||||
x-1 | -5 | -4 | -3 | -2 | -1 | 0 | 1 | 2 | 3 |
-(x-1) | 5 | 4 | 3 | 2 | 1 | 0 | -1 | -2 | -3 |
x | -4 | -3 | -2 | -1 | 0 | 1 | 2 | 3 | 4 |
|x+1| | 3 | 2 | 1 | 0 | 1 | 2 | 3 | 4 | 5 |
|x-2| | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 1 | 2 |
|x+1|+|x-2| | |||||||||
2x-1 | -9 | -7 | -5 | -3 | -1 | 1 | 3 | 5 | 7 |
-2x+1 | 9 | 7 | 5 | 3 | 1 | -1 | -3 | -5 | -7 |
気付いたことを記してみよう。