广东省2019年中考数学总复习第一部分知识梳理第一章数与式第1讲实数课件.ppt

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1、第一章 数与式,第一部分 知识梳理,第1讲 实数,1.(10分)(2018山西)下列有理数比较大小,正确的是( )A0-2 B-53 C-2-3 D1-42.(10分)(2018临安)如果a与-2互为相反数,那么a等于( )A-2 B2 C- D,B,B,3. (10分) (2017烟台) 我国推行“一带一路”政策以来,已确定沿线有65个国家加入,共涉及总人口约46亿人,用科学记数法表示该总人口为( )A4.6109人 B46108人 C0.461010人 D4.61010人4.(10分)(2018资阳)-0.000 35用科学记数法表示为( )A-3.510-4 B-3.5104 C3.51

2、0-4 D-3.510-3,A,A,5.(10分)(2018烟台)- 的倒数是( )A3 B-3C D-6. (10分) 实数 ,0,-, , ,0.101 001 000 1,其中无理数有( )A 1个 B 2个 C 3个 D 4个,B,B,7. (10分) (2017天水) 若x与3互为相反数,则 等于( )A0 B1 C2 D38.(10分)(2018青岛)如图K1 -1 -1,点A所表示的数的绝对值是( )A3 B-3C D-,A,A,9. (10分) (2017西宁) 计算:-22+( -)0+| 1-2sin60| .10.(10分)(2018遂宁)计算:( )-1+(-1) 0+2sin45+|-2|,解:原式= -4.,解:原式=6+,

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