河南省2019年中考数学总复习第一章数与式真题帮.doc

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1、1第一节 实 数1.2018河南,1- 的相反数是( )25A.- B. C.- D.25 25 52 522.2011河南,1-5 的绝对值是( )A.5 B.-5 C. D.-15 153.2018河南,2今年一季度,河南省对“一带一路”沿线国家进出口总额达 214.7亿元.数据“214.7 亿”用科学记数法表示为( )A.2.147102 B.0.214 7103 C.2.1471010 D.0.214 710114.2017河南,22016 年,我国国内生产总值达到 74.4万亿元.数据“74.4 万亿”用科学记数法表示为( )A.74.41012 B.7.441013C.74.410

2、13 D.7.4410145.2016河南,2某种细胞的直径是 0.000 000 95米,将 0.000 000 95用科学记数法表示为( )A.9.510-7 B.9.510-8C.0.9510-7 D.9510-86.2014河南,2据统计,2013 年河南省旅游业总收入达到约 3 875.5亿元.若将 3 875.5亿用科学记数法表示为 3.875 510n,则 n等于( )A.10 B.11 C.12 D.137.2017河南,1下列各数中比 1大的数是( )A.2 B.0 C.-1 D.-38.2015河南,1下列各数中最大的数是( )A.5 B. C. D.-839.2014河南

3、,1下列各数中,最小的数是( )A.0 B. C.- D.-313 1310.2018河南,11计算:|-5|- = . 911.2017河南,11计算:2 3- = . 412.2015河南,9计算:(-3) 0+3-1= . 13.2014河南,9计算: -|-2|= . 32714.2012河南,9计算:(- )0+(-3)2= . 2第二节 整 式1.2018河南,4下列运算正确的是( )A.(-x2)3=-x5 B.x2+x3=x5C.x3x4=x7 D.2x3-x3=12.2016河南,4下列计算正确的是( )A. - = B.(-3)2=68 2 2C.3a4-2a2=a2 D.

4、(-a3)2=a523.2014河南,4下列各式计算正确的是( )A.a+2a=3a2B.(-a3)2=a6C.a3a2=a6D.(a+b)2=a2+b24.2009河南,9下图是一个简单的运算程序.若输入 x的值为-2,则输出的数值为 .输入 x x2 +2 输出5.2017河南,16先化简,再求值:(2x+y)2+(x-y)(x+y)-5x(x-y),其中 x= +1,y= -1.2 26.2013河南,16先化简,再求值:(x+2)2+(2x+1)(2x-1)-4x(x+1),其中 x=- .2第三节 分 式1.2013河南,11化简: + = . 1 1(-1)2.2018河南,16先化简,再求值:( -1) ,其中 x= +1.1+1 2-1 23.2015河南,16先化简,再求值:( - ),其中 a= +1,b= -1.2-2+22-2 11 5 54.2014河南,16先化简,再求值:(2+ ),其中 x= -1.2-12- 2+1 235.2012河南,16先化简 (x- ),然后从- 10-1-3,故选 A.8.A -83,所以能被墨迹覆盖的数是 .7 3 7 11 7

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