Question

720 - [41 - (2 * x -5)]=420

Answer 1

\(720-\left[41-\left(2\times x-5\right)\right]=420\)

\(\Rightarrow41-\left(2\times x-5\right)=720-420\)

\(\Rightarrow41-\left(2\times x-5\right)=300\)

\(\Rightarrow2\times x-5=41-300\)

\(\Rightarrow2\times x-5=-259\)

\(\Rightarrow2\times x=-259+5\)

\(\Rightarrow2\times x=-254\)

\(\Rightarrow x=-254:2\)

\(\Rightarrow x=-127\)

Vậy \(x=-127\)

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Answer 2

720−[41−(2×x−5)]=420

⇒41−(2×x−5)=720−420

⇒41−(2×x−5)=300

⇒2×x−5=41−300

⇒2×x−5=−259

⇒2×x=−259+5

⇒2×x=−254

⇒x=−254:2

⇒x=−127

Vậy x=−127

 

Answer 3

\(720-\left[41-\left(2x-5\right)\right]=420\)

\(\Leftrightarrow\)\(41-\left(2x-5\right)=720-420=300\)

\(\Leftrightarrow\)\(2x-5=41-300=-259\)

\(\Leftrightarrow\)\(2x=-259+5=-254\)

\(\Leftrightarrow\)\(x=-127\)

Vậy...

Answer 4

720 - [ 41 - ( 2 * x - 5 ) ] = 420 

41 - ( 2 * x - 5 ) = 720 - 420 

41 - ( 2 * x - 5 ) = 300

2 * x - 5 = 41 - 300

2 * x - 5 = -259

2 * x = ( -259 ) + 5 

2 * x = -254 

x = ( -254 ) : 2 

x = -127

Vậy x = -127

Answer 5

\(720-\left[41-\left(2x-5\right)\right]=420\)

\(\Leftrightarrow41-\left(2x-5\right)=720-420\)

\(\Leftrightarrow41-\left(2x-5\right)=300\)

\(\Leftrightarrow2x-5=-259\)

\(\Leftrightarrow2x=-254\)

\(\Leftrightarrow x=-127\)

Vậy x=-127

Answer 6

720 - [ 41 - ( 2 * x - 5 )] = 420

           41 - ( 2 * x -5 )]  = 720 - 420   

           41 - ( 2 * x -5 )]  = 300

                  ( 2 * x -5 ) =  41 - 300

                   2 * x -5  = -259

                   2*x        = -259 + 5

                   2*x       = -254

                      x       = -254 : 2

                      x       = -127

Answer 7

\(720-\left[41-\left(2\cdot x-5\right)\right]=420\)

\(\Rightarrow41-\left(2\cdot x-5\right)=720-420\)

\(\Rightarrow41-\left(2\cdot x-2\right)=300\)

\(\Rightarrow2\cdot x-5=41-300\)

\(\Rightarrow2\cdot x-5=-259\)

\(2\cdot x=-259+5\)

\(\Rightarrow2\cdot x=-254\)

\(\Rightarrow x=-254\text{ : }2\)

\(\Rightarrow x=-127\)

\(\text{Vậy : }x=-127\)

Answer 8

\(720-\left[41-\left(2\times x-5\right)\right]=420\)

\(\Rightarrow41-\left(2\text{​​}\text{​​}\times x-5\right)=720-420\)

\(\Rightarrow41-\left(2\text{​​}\text{​​}\times x-5\right)=300\)

\(\Rightarrow2\text{​​}\times x-5=41-300\)

\(\Rightarrow2\text{​​}\times x-5=-259\)

\(\Rightarrow2\times x=-259+5\)

\(\Rightarrow2\times x=-254\)

\(\Rightarrow x=-254:2\)

\(\Rightarrow x=-127\)

Vậy x = -127

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