2019年中考数学总复习第一单元数与式第02课时实数的运算及大小比较课件湘教版201901151111.pptx

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UNIT ONE,第一单元 数与式,第 2 课时 实数的运算及大小比较,考点一 实数的运算,考点聚焦,0,相反数,负,0,正,负,0,考点二 实数的大小比较,大于,小于,大于,小,对点演练,题组一 教材题,D,16,7.71,题组二 易错题,【失分点】进行实数的运算时,弄错符号、负整数指数幂运算错误、运算顺序错误或在除法运算中错用分配律.,A,D,D,-16,-23,针对训练,探究二 实数的大小比较,【命题角度】 (1)在几个数中,选择最大(最小)的数; (2)判断几个实数的大小关系是否正确; (3)以数轴为载体综合考查三个或三个以上实数的大小比较.,C,B,针对训练,探究三 实数与数轴,【命题角度】 (1)实数与数轴上的点的一一对应关系; (2)根据数轴上的点表示的实数,确定有关代数式的符号或比较大小; (3)已知实数表示的点在数轴上的位置,化简代数式.,图2-2,C,针对训练,C,探究四 实数的估算,【命题角度】 (1)估算一个无理数在哪两个整数之间; (2)判断一个无理数与哪个整数更接近.,针对训练,

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