Question

giúp mình nhanh với ạ 

1.tìm x 

A, -x cộng 7/4 = 6/5 trừ 3/4

B,x trừ 5/6=0,25

C,x cộng 5/7=1-2/14 

d,x cộng 7/2 = 6-3/4

Answer 1

Bài 1: 

a: =>7/4-x=24/20-15/20=9/20

=>x=35/20-9/20=26/20=13/10

b: =>x=1/4+5/6=6/24+20/24=26/24=13/12

c: =>x-5/7=6/7

=>x=11/7

d: =>x+7/2=21/4

=>x=21/4-14/4=7/4

Answer 2

`-x + 7/4 = 6/5 - 3/4`

`-x + 7/4 = 24/20 - 15/20`

`-x + 7/4 = 9/20`

`-x = 9/20 - 7/4`

`-x = 9/20 - 35/20`

`-x=-13/10`

Vậy `-x = -13/10`

_____________________________

`x - 5/6 = 0,25`

`x-5/6=1/4`

`x=1/4+5/6`

`x=3/12+ 10/12`

`x=13/12`

Vậy `x = 13/12`

__________________________________

`x + 5/7 = 1-2/14`

`x+5/7=1-1/7`

`x+5/7=7/7-1/7`

`x+5/7=6/7`

`x = 6/7 - 5/7`

`x=1/7`

Vậy `x = 1/7`

________________________________

`x + 7/2 = 6 - 3/4`

`x + 7/2 = 24/4 - 3/4`

`x+7/2 = 21/4`

`x=21/4 - 7/2`

`x=21/4 - 14/4`

`x=7/4`

Vậy `x = 7/4`