Đáp án+Giải thích các bước giải:

 b) -1/4-3/4:x=-11/36

⇒3/4:x=(-1/4)+11/36

⇒3/4:x=1/18

⇒x=1/4:1/18

⇒x=27/2

Vậy x= 27/2

d) 5/7+2/3x=3/10

⇒2/3x=3/10-5/7

⇒2/3x=(-29/70)

⇒x=(-29/70):2/3

⇒x=-87/140

Vậy x=-87/140

f) 3/4x-1/2=3/7

⇒3/4x=3/7+1/2

⇒3/4x=13/14

⇒x=13/14:3/4

⇒x=26/21

Vậy x= 26/21

Chúc em học tốt!

@anhnguyen(xin ctlhn nếu thích!)

Hướng dẫn trả lời:

b) `-1/4 - 3/4 ÷ x = - 11/36`

`→ 3/4 ÷ x = -1/4 - (- 11/36)`

`→ 3/4 ÷ x = -1/4 + 11/36`

`→ 3/4 ÷ x = -9/36 + 11/36`

`→ 3/4 ÷ x = 2/36 = 1/18`

`→ x = 3/4 ÷ 1/18`

`→ x = 3/4 cdot 18/1`

`→ x = 27/2`

Vậy `x = 27/2`

d) `5/7 + 2/3x = 3/10`

`→ 2/3x = 3/10 - 5/7`

`→ 2/3x = 21/70 - 50/70`

`→ 2/3x = - 29/70`

`→ x = - 29/70 ÷ 2/3`

`→ x = - 29/70 cdot 3/2`

`→ x = - 87/140`

Vậy `x = -87/140`

f) `3/4x - 1/2 = 3/7`

`→ 3/4x = 3/7 + 1/2`

`→ 3/4x = 6/14 + 7/14`

`→ 3/4x = 13/14`

`→ x = 13/14 ÷ 3/4`

`→ x = 13/14 cdot 4/3`

`→ x = 26/21`

Vậy `x = 26/21`

Đáp án:

b) `x = 27/2`

d) `x = -87/140`

f) `x = 26/21`