Question

Answer 1

a) 3/15 - x = 6/5

x = 3/15 - 6/5

x = -1

 

Answer 2

$#Shả$

Xin mấy câu khá khó nha 

`f)(1/2+2x)(2x-3)=0`

`<=>[(1/2+2x=0),(2x-3=0):}`

`<=>[(2x=-1/2),(2x=3):}`

`<=>[(x=-1/4),(x=3/2):}`

Vậy `x in {(-1/4),3/2}`

`g)(4x-5)(5/(4)x-2)=0`

`<=>[(4x-5=0),(5/(4)x-2=0):}`

`<=>[(4x=5),(5/(4)x=2):}`

`<=>[(x=5/4).(x=8/5):}`

Vậy `x in {5/4;8/5}`

`h)1/4-(2x+1/2)^{2}=0`

`<=>(2x+1/2)^{2}=1/4`

`<=>(2x+1/2)^{2}=(+-1/2)^{2}`

`<=>[(2x+1/2=1/2),(2x+1/2=-1/2):}`

`<=>[(2x=0),(2x=-1):}`

`<=>[(x=0),(x=-1/2):}`

Vậy ...