a) 1-5/6+2/3 b) 2/7-3/8+11/7-(-1/3)+1/7-5/8 c) (-5/7+14/11)+(-11/14+14/-11)

Đáp án:

` a) ` ` 5/6 `

` b) ` ` 4/3 `

` c) ` ` {-3}/2 `

Giải thích các bước giải:

` a) 1 - 5/6 + 2/3 `

` = 6/6 - 5/6 + 4/6 `

` = 5/6 `

` b) 2/7 - 3/8 + 11/7 - ({-1}/3) + 1/7 - 5/8 `

` = (2/7 + 11/7 + 1/7) - (3/8 + 5/8) + 1/3 `

` = 14/7 - 8/8 + 1/3 `

` = 2 - 1 + 1/3 `

` = 1 + 1/3 `

` = 3/3 + 1/3 `

` = 4/3 `

` c) ({-5}/7 + 14/11) + ({-11}/14 + 14/{-11}) `

` = {-5}/7 + 14/11 - 11/14 - 14/11 `

` = ({-5}/7 - 11/14) + (14/11 - 14/11) `

` = {-10}/14 - 11/14 + 0 `

` = {-21}/14 `

` = {-3}/2 `