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1、第四讲 巧算速算班级 姓名 例1: 39399399939999399999例2:489487483485484486488例3:(1351989)-(2461988)例4:1009998979695949387654321(2)1234567891993例5:(1)2772283496535(2)29150950(3)265226例6:(1)2571411132(2)1029616(3)481000008125254例7:(1)9999991999(2)54999945(3)3607236280(4)278976(5)37182742例8:(1)856931273158(2)76521327
2、76532727例9:(1)47547525025(2)1(23)(34)(45)(56)(3)(123491011)(27252422)综合练习1. 4567345610561672.(198819861984642)-(13519851987)3.(1351997)(2461996)4.1234561991199219935.123456789101112199419951996199719986.304284896487.4561237894567891238.29999999999.123459912345999123459810.33986611.913139111314961312
3、. 25321436212513.(1)9(98)(87)(76)(65)(54)(43)14.11111111111115. 13579111999200016. (20041)(20032)(20023)(10031002)17. 123456789200518. 200520042003200220012000199919981997765432119. 3333333320. 282828349653521. 99999999999922. 1521327153272723.200320011112003733724. 1117171920174019371725. 11528713