Tính:1/1.4+1/4.7+1/7.10+...1/100.103
Giải thích
11.4+14.7+17.10+...+1100.103=13.31.4+34.7+37.10+...+3100.103
=1311−14+14−17+17−110+...+1100−1103=13.1−1103=34103
11.4+14.7+17.10+...+1100.103=13.31.4+34.7+37.10+...+3100.103
=1311−14+14−17+17−110+...+1100−1103=13.1−1103=34103