Question

giúp mình câu này nhé

84-3.(x+1)=42

Answer 1

84 - 3.( x + 1 ) = 42

       3.(x + 1 ) = 84 - 42

       3 . ( x + 1 ) = 42

              x + 1  = 42 : 3 

              x + 1  = 14

              x        = 14 - 1

              x        = 13

Vậy x = 13

Answer 2

\(84-3\left(x+1\right)=42\)

\(\Leftrightarrow84-3x-3=42\)

\(\Leftrightarrow81-3x=42\)

\(\Leftrightarrow3x=81-42\)

\(\Leftrightarrow3x=39\)

\(\Leftrightarrow x=13\)

vậy x=13

Answer 3

camon các bạn nhiều

Answer 4

84 - 3 . ( x + 1) = 42

= (84 : 42 ) x 3 x (84 : 42) + 1

x = 13

Đs

Answer 5

84-3(x+1)=42

3(x+1)=84-42

3(x+1)=42

x+1=42:3

x+1=14

x=14-1

x=13

Vậy x=13

Answer 6

3(x+1)=84-42=42

x+1   =42:3

x+1   =14

x =14-1

x=13

Answer 7

Ta có : 84 - 3(x + 1) = 42

=> 84 - 3x - 3 = 42

=> 81 - 3x = 42

=> 3x = 81 - 42

=> 3x = 39

=> x = 13