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(-2,-4) (-3,-6) (-4,-8) (-5,-10)
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(-5,-10 ) (-4,-8 ) . (-3,-6) (-2,-4)
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(4,2) (-4,-2) (6,-3) (4,2)或(-4,-2)
(-1,2) (-3,6) (3,-6) (-3,6)或(3,-6)
(-∞,0)∪(0,+∞) (-∞,-3)∪(-3,+∞) (-∞,3)∪(3,+∞) [-3,3)
(-2,-4) (-3,-6) (-4,-8) (-5,-10)