B=-5/6×4/19+-7/12-4/19-40/57

2 câu trả lời

`B = (-5)/6 xx 4/19 + (-7)/12 - 4/19 - 40/57`

   `= (-10)/57 + (-7)/12 - 4/19 - 40/57`

   `= (-173)/228 - 4/19 - 40/57`

   `= (221)/228 - 40/57`

   `= (-127)/76`

`B = (-5)/6 xx 4/19 + (-7)/12 - 4/19 - 40/57`

`=> B = (-10)/57 + (-7)/12 - 4/19 - 40/57`

`=> B = (-173)/228 - 4/19 - 40/57`

`=> B = (-221)/228 - 40/57`

`=> B = (-127)/76`

Vậy `B = (-127)/76`

`#dtkc`