Toán Lớp 9: Cho các đường thẳng $ y= 0,5x +2$ ; $ y=0,5x – 1 $ ; $ y = 1,5x + 2 $.
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Toán Lớp 9: Cho các đường thẳng $ y= 0,5x +2$ ; $ y=0,5x – 1 $ ; $ y = 1,5x + 2 $.
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