1、分数的巧算（一）一、填空题1.计算: . 258.430258.62. . 198901913.1000 减去它的一半,再减去余下的三分之一,再减去余下的四分之一,依此下去,直到余下的五百分之一,最后剩下 .4.计算: .109431215.计算: . 46286846.计算: .3127.计算: .6514548.计算: .1975398537421 69.计算: .62761610.计算: 20151841296381642= .二、解答题11.尽可能化简 .427863190512.计算:. 914637281942112113.计算: .1932132114.计算:. 97319863
2、756453421分数的巧算（二）一、填空题1.计算: = .13476132742.计算: = .2598.053.计算: = .43761254. 4.计算: = .0.0.2.5.计算:= . 91513161416.计算: = .235677.计算: = .3214354618.计算: = .18019.计算: = . 293181321309910.计算: 217654376542 = .321二、问答题11.用简便方法计算: .42130912765312.计算: .(得数保留三位小数)987.9.113.计算: 1332.19219819814.计算: .2981027203284
