Question

tìm x biết:

a)15.5(x-35)-525=0

b)[3.(70-x)+5]:2=46

 

Answer 1

`a)`

`15.5(x-35)-525=0`

`=> 15.5(x-35)=0+525`

`=> 15.5(x-35)=525`

`=> 5(x-35)=525:15`

`=> 5(x-35)=35`

`=>x-35=35:5`

`=>x-35=7`

`=>x=7+35`

`=>x= 42`

`b)`

`[3.(70-x)+5]:2=46`

`=> 3.(70-x)+5=46.2`

`=> 3.(70-x)+5= 92`

`=> 3.(70-x)= 92-5`

`=>  3.(70-x)=87`

`=>70-x=87:3`

`=>70-x=29`

`=>x=70-29`

`=>x= 41`

Answer 2

a, 

 15.5.(x-35)-525=0

<=> 15.5.(x-35)=525

<=> 75.(x-35)=525

<=>x-35=525:75

<=>x-35=7

<=>x=42

b.[3.(70-x)+5]:2=46

<=>3.(70-x)+5=92

<=>3.(70-x)=87

<=>70-x=29

<=>x=41

Answer 3

a: =>75(x-35)=525

=>x-35=7

=>x=42

b: =>(210-3x+5)=96

=>3x=215-96=119

=>x=119/3