2020届数学中考二轮专题训练数和式 共34张

1、数与式,A,代表基础题,B,代表提升题,第,1,题,1,A,2019,河南,1,2,的绝对值是,A,1,2,B,1,2,C,2,D,2,B,第,2,题,2,A,2019,安徽,在,2,1,0,1,这四个,数中，最小的数是,A,2,B,1,C,0,D,1,A,第,3,题,3,A,2018,荆门,8,的相反数的立方根是,A,2,B,1,2,C,2,D,1,2,C,第,4,题,4,A,2019,安徽,2019,年“五一”假日期间,我省银联网络交易总金额接近,161,亿元，其中,161,亿用科学记数法表示为,A,1,61,10,9,B,1,61,10,10,C,1,61,10,11,D,1,61,10

2、,12,B,第,5,题,5,A,2018,淄博,与,37,最接近的整数是,A,5,B,6,C,7,D,8,B,第,6,题,6,A,2018,兰州,下列二次根式中,是最简二,次根式的是,A,18,B,13,C,27,D,12,B,第,7,题,7,A,2018,怀化,使,x,3,有意义的,x,的取值,范围是,A,x,3,B,x,3,C,x,3,D,x,3,C,第,8,题,8,A,若分式,x,2,4,x,的值为,0,则,x,的值是,A,2,或,2,B,2,C,2,D,0,A,第,9,题,9,A,2018,济宁,多项式,4,a,a,3,分解因式的,结果是,A,a,4,a,2,B,a,2,a,(2,a,

3、C,a,a,2,a,2,D,a,a,2,2,B,第,10,题,10,B,2018,北京,如果,a,b,2,3,那么代,数式,a,2,b,2,2,a,b,a,a,b,的值为,A,3,B,2,3,C,3,3,D,4,3,A,第,11,题,11,A,2018,张家界,目前世界上能制造的芯,片最小工艺水平是,5,纳米，而我国能制造芯片的最,小工艺水平是,16,纳米，已知,1,纳米,10,9,米，用科,学记数法将,16,纳米表示为,_,米,1.6,10,8,第,12,题,12,A,2018,包头,若,a,3,b,2,0,3,a,b,6,0,则,b,a,的值为,_,2,第,13,题,13,A,2018,怀

4、,化,因,式,分,解,ab,ac,_,a,b,c,第,14,题,14,A,2018,兰,州,因,式,分,解,x,2,y,y,3,_,y,x,y,x,y,第,15,题,15,A,2018,成都,已知,a,6,b,5,c,4,且,a,b,2,c,6,则,a,的值为,_,12,第,16,题,16,A,2018,烟,台,12,与,最,简,二,次,根,式,5,a,1,是同类二次根式，则,a,_,2,第,17,题,17,A,2018,广东,已知,a,b,b,1,0,则,a,1,_,2,第,18,题,18,A,2018,临沂,已知,m,n,mn,则,m,1,n,1,_,1,第,19,题,19,A,2018,

5、岳阳,已知,a,2,2,a,1,则,3,a,2,2,a,2,的值为,_,5,第,20,题,图放大,20,B,2018,徐州,如图，每个图案均由边长,相等的黑、白两色正方形按规律拼接而成，照此规,律，第,n,个图案中白色正方形比黑色正方形多,_,个,用含,n,的代数式表示,4,n,3,第,20,题,图还原,第,21,题,1,21,A,16,分,计算下列各式,1)(2018,南通,2,2,3,64,3,0,1,3,2,解,原式,4,4,1,9,8,第,21,题,2,21,A,16,分,计算下列各式,2)(2018,宿迁,2,2,7,0,3,2,解,原式,4,1,2,3,5,3,第,21,题,3,2

6、1,A,16,分,计算下列各式,3)(2018,舟山,2,8,1,3,3,1,0,解,原式,4,2,2,3,1,4,2,第,21,题,4,21,A,16,分,计算下列各式,4)(2018,常德,2,0,1,2,3,12,1,2,2,解,原式,1,2,3,1,2,3,4,2,第,22,题,1,22,A,12,分,化简下列各式,1)(2018,无锡,x,1,2,x,2,x,解,原式,x,2,2,x,1,x,2,x,3,x,1,第,22,题,2,22,A,12,分,化简下列各式,2)(2018,扬州,(2,x,3,2,2,x,3)(2,x,3,解,原式,4,x,2,12,x,9,4,x,2,9,4,

7、x,2,12,x,9,4,x,2,9,12,x,18,第,22,题,3,22,A,12,分,化简下列各式,3)(2018,宜宾,1,2,x,1,x,3,x,2,1,解,原式,x,1,x,1,2,x,1,x,1,x,1,x,3,x,3,x,1,x,1,x,1,x,3,x,1,第,22,题,4,22,A,12,分,化简下列各式,4)(2018,重庆,x,2,x,3,x,2,x,2,4,x,4,x,3,解,原式,x,2,x,2,x,3,x,3,x,3,x,2,4,x,4,x,2,x,2,x,3,x,3,x,2,2,x,2,x,2,第,23,题,1,23,A,12,分,将下列各式先化简，再求值,1)(

8、2018,邵,阳,a,2,b,a,2,b,a,2,b,2,8,b,2,其中,a,2,b,1,2,解,原式,a,2,4,b,2,a,2,4,ab,4,b,2,8,b,2,a,2,4,b,2,a,2,4,ab,4,b,2,8,b,2,4,ab,当,a,2,b,1,2,时，原式,4,ab,4,2,1,2,4,第,23,题,2,23,A,12,分,将下列各式先化简，再求值,2)(2018,长春,x,2,2,x,1,1,x,1,其中,x,5,1,解,原,式,x,2,2,1,x,1,x,2,1,x,1,x,1,x,1,x,1,x,1,当,x,5,1,时，原式,5,1,1,5,第,24,题,1,24,B,2018,吉林,某同学化简,a,a,2,b,a,b,a,b,时出现了错误，解答过程如下,原式,a,2,2,ab,a,2,b,2,第一步,a,2,2,ab,a,2,b,2,第二步,2,ab,b,2,第三步,1,该同学解答过