Toán Lớp 5: S=1/7+1/8+1/9+1/10+1/12+1/14+1/15+1/18+1/22+1/24+1/28+1/30

Question

Toán Lớp 5:  S=1/7+1/8+1/9+1/10+1/12+1/14+1/15+1/18+1/22+1/24+1/28+1/30

maianhtuanh · Answer

Đ&Aacute;P &Aacute;N: 301330        Giải th&iacute;ch c&aacute;c bước  l&agrave;m của m&igrave;nh:         S=1/7+1/8+1/9+1/10+1/12+1/14+1/15+1/18+1/22+1/24+1/28+1/30        s=17+18+19+110+112+114+115+118+122+124+128+130       s=71​+81​+91​+101​+121​+141​+151​+181​+221​+241​+281​+301       ​????=301330

dongoctuan · Answer

????=17+18+19+110+112+114+115+118+122+124+128+130  s=         s  =           7      1     ​      +           8      1     ​      +           9      1     ​      +           10      1     ​      +           12      1     ​      +           14      1     ​      +           15      1     ​      +           18      1     ​      +           22      1     ​      +           24      1     ​      +           28      1     ​      +           30      1                      ​        ????=301330