若ab大于0,则有___ ,若ab=0,则有_____,如果a+b大于0,ab小于0,则有_____.
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![若ab大于0,则有___ ,若ab=0,则有_____,如果a+b大于0,ab小于0,则有_____.](/uploads/image/z/2509717-13-7.jpg?t=%E8%8B%A5ab%E5%A4%A7%E4%BA%8E0%2C%E5%88%99%E6%9C%89___+%2C%E8%8B%A5ab%3D0%2C%E5%88%99%E6%9C%89_____%2C%E5%A6%82%E6%9E%9Ca%2Bb%E5%A4%A7%E4%BA%8E0%2Cab%E5%B0%8F%E4%BA%8E0%2C%E5%88%99%E6%9C%89_____.)
若ab大于0,则有___ ,若ab=0,则有_____,如果a+b大于0,ab小于0,则有_____.
若ab大于0,则有___ ,若ab=0,则有_____,如果a+b大于0,ab小于0,则有_____.
若ab大于0,则有___ ,若ab=0,则有_____,如果a+b大于0,ab小于0,则有_____.
若ab大于0,则有_a,b同号__ ,若ab=0,则有_a=0或b=0或a,b都=0____,如果a+b大于0,ab小于0,则有_a>-b>0>b____.速度!