Question

Tìm x biết

a) 1/2x + 1/2 = 5/2

b) -2/3 - 1/3(2x - 5) = 3/2

c) 2/5x + 1/2 = -3/4

d) 1/3x - 8 = 1/2

e) x - 1/4 = 5/8 . 2/3

g) 3/4 - x = 1/5

h) 7/2 + 2.x = -3/4

i) 3/4 - x = 1/5

k) 1/3 + 2/3x = 4/3

l) 3/5x + 1/4 = 1/10

m) -4/3x + 3/2 = 5/6

Ai giúp em với ạ

Answer 1

Answer 2

`1/2 x + 1/2 = 5/2`

`1/2 x = 5/2 - 1/2`

`1/2 x = 2`

`x=2:1/2`

`x=2 xx 2`

`x=4`

____________________

`-2/3 - 1/3.(2x-5)=3/2`

`1/3.(2x-5)= -2/3 - 3/2`

`1/3.(2x-5) = -4/6 - 9/6`

`1/3 . (2x-5) = -13/6`

`2x-5 = -13/6 : 1/3`

`2x-5 = -13/5 xx 3`

`2x-5 = -13/2`

`2x=-13/2 + 5`

`2x = -13/2 + 10/2`

`2x = -3/2`

`x=-3/2 : 2`

`x=-3/2 xx 1/2`

`x=-3/4`

__________________________________

`2/5 x + 1/2 = -3/4`

`2/5 x = -3/4-1/2`

`2/5 x= -3/4 - 2/4`

`2/5 x = -5/4`

`x=-5/4 : 2/5`

`x=-5/4 xx 5/2`

`x=-25/8`

________________________

`1/3 x - 8 = 1/2`

`1/3 x =1/2+8`

`1/3 x = 1/2 + 16/2`

`1/3 x = 17/2`

`x=17/2 : 1/3`

`x=17/2 xx 3`

`x=51/2`

__________________________

`x-1/4 = 5/8 . 2/3`

`x-1/4 = 5/12`

`x=5/12+1/4`

`x=5/12 + 3/12`

`x=8/12`

`x=2/3`

________________________

`3/4-x = 1/5`

`x=3/4-1/5`

`x=15/20 - 4/20`

`x=11/20`

_____________________

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

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

`2x=-3/4 - 14/4`

`2x=-17/4`

`x=-17/4 : 2`

`x=-17/4 xx 1/2`

`x=-17/8`

_________________________

`3/4 - x = 1/5`

`x=3/4-1/5`

`x=15/20 - 4/20`

`x=11/20`

_______________________

`1/3 + 2/3 x = 4/3`

`2/3 x = 4/3 - 1/3`

`2/3 x = 3/3`

`2/3 x = 1`

`x=1 : 2/3`

`x=1 xx 3/2`

`x=3/2`

________________________

`3/5 x + 1/4 = 1/10`

`3/5 x =1/10 - 1/4`

`3/5x=2/20 - 5/20`

`3/5 x = -3/20`

`x=-3/20 :3/5`

`x=-3/20 xx 5/3`

`x=-1/4`

______________________

`-4/3x + 3/2 = 5/6`

`-4/3x = 5/6 - 3/2`

`-4/3 x = 5/6 - 9/6`

`-4/3x = -2/3`

`x=-2/3 : (-4/3)`

`x=2/3 : 4/3`

`x=2/3 xx 3/4`

`x=1/2`