Question

  giúp mk bài 8,9

Answer 1

b8:

`a) x+ 3,12=14,6-8,5`

`<=> x+3,12 =6,1`

`<=>x=6,1-3,12`

`<=>x=2,98`

`b) x-5,14=(15,7+2,3).2`

`<=> x-5,14=18.2`

`<=>x-5,14=36`

`<=>x=36+5,14=41,14`

`c)31,5-x=(18,6-12,3):3`

`<=>31,5-x=(6,3):3`

`<=>31,5-x=2,1`

`<=>x=31,5-2,1=29,4`

`d)x.12,5=(32,6 -10,4).5`

`<=>x=((32,6 -10,4).5)/12,5 =8,88`

 

Answer 2

b9:

`a)2,6(x+3,4)=-13`

`<=>x+3,4=-13/2,6 =-5`

`<=>x=-5-3,4=-8,4`

`b)2,5x -4,16=7,5:1,5`

`<=> 2,5x -4,16=5`

`<=>2,5x=5+4,16=9,16`

`<=>x=9,16/2,5=3,664`

`c)3,4:x -15,6=-16`

`<=>3,4:x =-16+15,6=-1,6`

`<=>x=3,4/(-1,6) =-2,125`

Answer 3

bài 8 trước