小学六年级举一反三B版P10简便运算那本人就以“/”代表分数线好了 比如说1/2,1是分子,2是分母1/12+1/20+1/30+1/42+1/56+1/72+1/901-1/4+1/20+1/30+1/42+1/561/1*5+1/5*9+1/9*13+.+1/55*59(这题的分母就是1*5、5*9...)(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*)*(1/3+1/5+1/7)1/3+1/15+1/35+1/63+1/99

问题描述:

小学六年级举一反三B版P10简便运算
那本人就以“/”代表分数线好了 比如说1/2,1是分子,2是分母
1/12+1/20+1/30+1/42+1/56+1/72+1/90
1-1/4+1/20+1/30+1/42+1/56
1/1*5+1/5*9+1/9*13+.+1/55*59
(这题的分母就是1*5、5*9...)
(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*)*(1/3+1/5+1/7)
1/3+1/15+1/35+1/63+1/99

1/12+1/20+1/30+1/42+1/56+1/72+1/90(进行分数拆分) =1/3-1/4+1/4+1/5~中间省略~-1/10 =1/3-1/10 7/30 1-1/4+1/20+1/30+1/42+1/56 =1-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8 =1-1/8 =7/8 1/1*5+1/5*9+1/9*13+.+1/55...