Tính `1/3 + 3/37 + 1/(7.2) + 5/(2 . 13) + 3/(13.4) + 5/(4.21)`

Đáp án`:206/259`

Giải thích các bước giải`:`

`1/3+3/37+1/(7*2)+5/(2*13)+3/(13*4)+5/(4*21)`

`=1/3+3/37+1/14+5/26+3/52+5/84`

`=37/111+9/111+1/14+5/26+3/52+5/84`

`=46/111+1/14+5/26+3/52+5/84`

`=644/1554+111/1554+5/26+3/52+5/84`

`=755/1554+5/26+3/52+5/84`

`=19630/40404+7770/40404+3/52+5/84`

`=6850/10101+3/52+5/84`

`=356200/525252+30303/525252+5/84`

`=2287/3108+5/84`

`=192108/261072+15540/261072`

`=206/259`