一元二次不等式高一数学课件
日期：2010-08-28 08:36
<<<>>>??????????2002byShawnaHaiderTherearetwokindsofnotationforgraphsofinequalities:opencircleorfilledincirclenotationandintervalnotationbracketsYoushouldbefamiliarwithboth[BothofthesenumberlinesshowtheinequalityaboveTheyarejustusingtwodifferentnotationsBecausetheinequalityis"greaterthanorequalto"thesolutioncanequaltheendpointThatiswhythecircleisfilledinWithintervalnotationbrackets，asquarebracketmeansitcanequaltheendpointcirclefilledinsquaredendbracketRemember---thesemeanthesamething---justtwodifferentnotationsLetslookatthetwodifferentnotationswithadifferentinequalitysign)Sincethissays"lessthan"wemakethearrowgotheotherwaySinceitdoesntsay"orequalto"thesolutioncannotequaltheendpointThatiswhythecircleisnotfilledinWithintervalnotationbrackets，aroundedbracketmeansitcannotequaltheendpointcirclenotfilledinroundedendbracketRemember---thesemeanthesamething---justtwodifferentnotationsCompoundInequalitiesLetsconsidera"doubleinequality"(havingtwoinequ，
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