a) (+3) . (+9) b) (-3) . 7 c)13 . (-5) d)(-150) . (-4) e)(+7) . (-5) f)(-25) . 8 g) 18 . (-15) 5) trên tia Ox, vẽ hai đoạn thẳng OM và ON sao cho OM = 3cm , ON = 6cm. tính MN > so sánh OM và MN. 6)trên tia Ox , vẽ ba đoạn thẳng OA , OB , OC sao cho OA = 2cm , CB = 5cm , OC = 8cm. so sánh BC và BA. các bạn ghi lời giải luôn nha cảm ơn ạ

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