Question

38+5.(x-9)=123

Answer 1

Giải:

\(38+5.\left(x-9\right)=123\)

\(\Leftrightarrow5.\left(x-9\right)=123-38\)

\(\Leftrightarrow5.\left(x-9\right)=85\)

\(\Leftrightarrow\left(x-9\right)=\dfrac{85}{5}\)

\(\Leftrightarrow x-9=17\)

\(\Leftrightarrow x=17+9\)

\(\Leftrightarrow x=26\)

Vậy \(x=26\).

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Answer 2

\(38+5\left(x-9\right)=123\\ \Leftrightarrow38+5x-45=123\\ \Leftrightarrow5x=123-38+45\Leftrightarrow5x=130\\ \Leftrightarrow x=26\)

Vậy...

Answer 3

\(38+5.\left(x-9\right)=123\)

\(\Rightarrow5.\left(x-9\right)=123-38\)

\(\Leftrightarrow5.\left(x-9\right)=85\)

\(\Leftrightarrow x-9=85:5\)

\(\Leftrightarrow x-9=17\)

\(\Leftrightarrow x=17+9=26\)

Vậy \(x=26\)

Answer 4

38 + 5 . ( x - 9 ) = 123

5 . ( x - 9 ) = 123 - 38

5 . ( x - 9 ) = 85

x - 9 = 85 : 5

x - 9 = 17

x = 17 + 9

x = 26