中考数学专题复习卷有理数与无理数.doc

中考数学专题复****卷:有理数一、-4,0,-1,3这四个数中,既不是正数又不是负数的数是(  )A. -4                                     B. 0                                        C. -1                                       D. :的结果是(  )A. -3                                      B. 0                                         C. -1                                        D. (  )A. |﹣2|=2                     B. ﹣2=﹣|﹣2|                     C. ﹣(﹣2)=|﹣2|                 D. ﹣|2|=|﹣2|℃记作+13℃,零下2℃可记作(  )A. 2                                       B. -2                                    C. -2℃                                    D. 2℃,2018年“五一小长假”期间,广东各大景点共接待游客约14420000人次,将数14420000用科学记数法表示为(  )A. ×107                     B. ×107                     C. ×108                     D. ×-1小2的数是(  )A. 3                                       B. 1                                          C. -2                                          D. -37.-2018的相反数是(  )A. 2018                                B. -2018                                C.                                D. ,,这个数用科学记数法(精确到十亿位),应表示为(  )A. ×1010                       B. ×1011                        C. ×1010                        D. ×(   ).A.                                       B.                                        C.                                        D. 10.-的倒数是(  )A.                                     B. -                               C.                                     D. -,绝对值最小的数是(  ).-2D.-,这个数是(  )A. 正数                                B. 负数                                  C. 非正数                                  D. 非负数二、:=,﹣3与a,并且a>﹣3,:(﹣2)2=,:20180-=,则a+b=△ABC的三边长分别为a,b,c,则|a﹣b﹣c|﹣|b﹣a﹣c|=.⑴⑵⑶