2019年中考数学真题分类训练——专题二:数与式1.(2019安徽)计算的结果是__________.2.(2019杭州)因式分解:1–x2=__________.3.(2019绍兴)因式分解:x2-1=__________.4.(2019湖州)分解因式:x2–9=__________.5.(2019台州)分解因式:ax2–ay2=__________.6.(2019黄冈)分解因式3x2-27y2=__________.7.(2019台州)若一个数的平方等于5,则这个数等于__________.8.(2019哈尔滨)把多项式a3-6a2b+9ab2分解因式的结果是__________.9.(2019舟山)分解因式:x2–5x=__________.10.(2019衡阳)=__________.12.(2019衢州)计算:__________.13.(2019镇江)氢原子的半径约为0.00000000005m,用科学记数法把0.00000000005表示为__________.14.(2019金华)当x=1,y=时,代数式x2+2xy+y2的值是________.15.(2019重庆A卷)计算:=__________.16.(2019德州),则的取值范围是__________.17.(2019聊城)计算:=__________.18.(2019宿迁)实数4的算术平方根为__________.19.(2019临沂)一般地,如果,则称为的四次方根,一个正数的四次方根有两个.它们互为相反数,记为,若,则__________.20.(2019舟山)数轴上有两个实数a,b,且a>0,b<0,a+b<0,则四个数a,b,–a,–b的大小关系为__________(用“<”号连接).21.(2019连云港)64的立方根是__________.22.(2019金华)计算:|–3|–2tan60°++()–1.23.(2019嘉兴)数轴上有两个实数a,b,且a>0,b<0,a+b<0,则四个数a,b,-a,-b的大小关系为__________(用“<”号连接).24.(2019湖州)计算:.25.(2019天津)计算的结果等于__________.26.(2019绍兴)计算:4sin60°+(π﹣2)0﹣(﹣)-2﹣.27.(2019天津)计算的结果等于__________.28.(2019衢州)计算:|﹣3|+(π﹣3)0tan45°.29.(2019南充)计算:__________.30.(2019台州)计算:.30.(2019湖州)化简:(a+b)2–b(2a+b).31.(2019广州)已知P(a≠±b).(1)化简P;(2)若点(a,b)在一次函数y=x的图象上,求P的值.32.(2019杭州)化简:.圆圆的解答如下:=4x–2(x+2)–(x2–4)=–x2+2x圆圆的解答正确吗?如果不正确,写出正确的答案.2019年中考数学真题分类训练——专题二:数与式参考答案1.(2019安徽)计算的结果是__________.【答案】32.(2019杭州)因式分解:1–x2=__________.【答案】(1–x)(1+x)3.(2019绍兴)因式分解:x2-1=__________.【答案】(x+1)(x-1)4.(2019湖州)分解因式:x2–9=__________.【答案】(x+3)(x–3)5.(2019台州)分解因式:ax2–ay2=__________.【答案】a(x+y)(x–y)6.(2019黄冈)分解因式3x2-27y2=__________.【答案】3(x+3y)(x-3y)7.(2019台州)若一个数的平方等于5,则这个数等于__________.【答案】±8.(2019哈尔滨)把多项式a3-6a2b+9ab2分解因式的结果是__________.【答案】a(a-3b)29.(2019舟山)分解因式:x2–5x=__________.【答案】x(x–5)10.(2019衡阳)=__________.【答案】12.(2019衢州)计算:__________.【答案】13.(2019镇江)氢原子的半径约为0.00000000005m,用科学记数法把0.00000000005表示为__________.【答案】5×10-1114.(2019金华)当x=1,y=时,代数式x2+2xy+y2的值是________.【答案】15.(2019重庆A卷)计算:=__________.【答案】316.(2019德州),则的取值范围是__________.【答案】17.(2019聊城)计算:=__________.【答案】18.(2019宿迁)实数4的算术平方根为__________.【答案】219.(2019临沂)一般地,如果,则称为的四次方根,一个正数的四次方根有两个.它们互为相反数,记为,若,则__________.【答案】20.(2019舟山)数轴上有两个实数a,b,且a>0,b<0,a+b<0,则四个数a,b,–a,–b的大小关系为__________(用“<”号连接).【答案】b<–a<a<–b21.(2019连云港)64的立方根是__________.【答案】422.(2019金华)计算:|–3|–2tan60°++()–1.【答案】623.(2019嘉兴)数轴上有两个实数a,b,且a>0,b<0,a+b<0,则四个数a,b,-a,-b的大小关系为__________(用“<”号连接).【答案】24.(2019湖州)计算:.【答案】825.(2019...