分数的速算与巧算.pdfVIP免费

分数的速算与巧算【例1】(★★★)()()()()111120081111()()()....()______200811112341000计算【例2】（★★★）计算：111111111112345678910023423423422342342342【例3】(★★★)1111222223420345203331818194520192020课前热身ba11abab+ba11++baabab111【例4】(★★)=11111＋＋＋＋1223344556【例5】(★★)=121212＋＋…＋101111125960【例6】(★★★)111111111111111111－－－－－－－－2612203042567290【例7】(★★★)计算：1111366991296992【例8】(★★★★)15111929970198991511192997019899＋＋＋＋＋＋＋2612203097029900【例9】(★★★)=57911131517191－＋－＋－＋－＋6122030425672903