Question

Bài tìm x biết:

20- 5.(2-x) =45

Answer 1

\(20-5\cdot(2-x)=45\\\Rightarrow5\cdot(2-x)=20-45\\\Rightarrow5\cdot(2-x)=-25\\\Rightarrow2-x=-25:5\\\Rightarrow2-x=-5\\\Rightarrow x=2-(-5)\\\Rightarrow x=2+5=7\)

Answer 2

20 - 5.(2 - x) = 45

5.(2 - x) = 20 - 45

5.(2 - x) = (-25)

2 - x = (-25) : 5 

2 - x = (-5)

x = 2 - (-5)

x = 2 + 5

x = 7

Answer 3

20 - 5.(2 - \(x\)) = 45

20 - 10 + 5\(x\)  = 45

     10   + 5\(x\)  = 45

             5\(x\)   = 45 - 10

            5\(x\)    = 35

             \(x\)    = 35 : 5

              \(x\)   = 7 

 

 

Answer 4

20−5⋅(2−x)=45⇒5⋅(2−x)=20−45⇒5⋅(2−x)=−25⇒2−x=−25:5⇒2−x=−5⇒x=2−(−5)⇒x=2+5=7