2019中考数学总复习第二轮纵向小专题复习专题1实数的运算课件.ppt

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第二轮 纵向小专题复习,专题1 实数的运算,1 计算:|-2|-20180+(-2)-1,解:原式=2-1- = .,2 计算:|-3|+ -(-1)0+ ,解:原式=3+3-1+2=7.,3 计算: + -|-2|-(2- )0,解:原式=3+2-2-1=2.,4 计算:(-1)2+(-3.14)0-| |.,解:原式=1+1-2+ = .,5 计算: +(-3)0-6cos45+ ,解:原式=3 +1-6 +2=3 +1-3 +2=3.,6 计算: +(-3)0+ -4sin45,解:原式=2 +1+3-4=2 +1+3-2 =4.,谢谢!,

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