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No.18

y = | x² + 3x - 4 | y = | x² - x - 2 | y = | x - 2 | + | x + 3 |
y = | x - 2 | + 2| x + 1 | y = | 2x - 1 | + | 3x + 2 | y = x² - 2|x| + 1

No.19

y = x| x - 2 | + 1 y = | x² - 3x - 4 | + x + 1 y = | x² - 3x | + x - 2
y = | 2x² + x - 6 | + 3x y = | |x| - 1 | y = | 2|x - 2| - | x + 1||

No.20

| x | - 2 = 1/2x | x - 2 | + | x + 1 | = x + 3 | x + 1 | - | x - 2 | > x
2| x - 1 | + | x + 2 | < x + 4 | x² - 4 | = 1 x² - 4| x | + 3 > 0

No.21

| x² -2x | < x + 4 | -x² + 2x + 4 | ≥ 2x ( x + 1 )| x - 3 | > 2x

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