Đáp án:
$\\$
Bài `1.`
`a,`
`x ÷ 3/4 - 1/4 =5/6 + 4/3`
`-> x ÷ 3/4 -1/4 = 13/6`
`-> x ÷ 3/4 = 13/6 +1/4`
`-> x ÷3/4= 29/12`
`->x=29/12 ×3/4`
`->x=29/16`
Vậy `x=29/16`
`b,`
`x ÷ 8/11 = 11/3 + 1/4`
`-> x ÷ 8/11 = 47/12`
`-> x=47/12 × 8/11`
`->x=94/33`
Vậy `x=94/33`
`c,`
`5/7x - 25%x = 4/6`
`-> (5/7 -25%)x=4/6`
`-> 13/28x = 4/6`
`->x=4/6 ÷ 13/28`
`->x=56/39`
Vậy `x=56/39`
`d,`
`-3 1/4 + 3/4x = (-2)/5`
`-> (-13)/4 + 3/4x = (-2)/5`
`-> 3/4x = (-2)/5 - (-13)/4`
`-> 3/4x =57/20`
`->x=57/20 ÷ 3/4`
`->x=19/5`
Vậy `x=19/5`