23 × (42 - x) = 23

          42 - x  = 23 : 23

          42 - x  = 1

                  x  = 42 - 1

                  x  = 41.

23 * ( 42 - x ) = 23 

42 - x = 23 / 23 

42 - x = 1

x = 42 -1 

x = 41

Tl

Các bn ở dưới làm đr

#Kirito

23:23=1

42-x=1

x=41

23.(42-X)=23

=>42-X=23:23

=>42-X=1

=>X=42-1

=>X=41

23.(42 - x) = 23

       42 - x  = 23 : 23

       42 - x  = 1

              x   = 42 - 1

              x    = 41

Vậy x = 41

23.(42-x)=23

42-x=23:23

42-x=1

x=42-1

x=41

bạn nhờ thiệt thì giúp

= 42-x=23:23

= 42-x=1

=  42-1

=41

a) \(\left(x+13\right):5=12\)

\(\Rightarrow x+13=12\cdot5\)

\(\Rightarrow x+13=60\)

\(\Rightarrow x=60-13\)

\(\Rightarrow x=47\)

b) \(23\cdot\left(42-x\right)=23\)

\(\Rightarrow42-x=23:23\)

\(\Rightarrow42-x=1\)

\(\Rightarrow x=42-1\)

\(\Rightarrow x=41\)

23 . (42 - x) = 23

          42 - x = 23 : 23

          42 - x = 1

                 x = 42 - 1

                 x = 41

23*(42-x)=23

42-x       =23:23

42-x       =1

    x       =42-1

   x        =41

23*(42-x)=23

(42-x)=23:23

(42-x)=1

x=42-1

x=41

\(23.\left(42-x\right)=23\)

<=>  \(42-x=1\)

<=>  \(x=41\)

Vậy...

hk tốt

^^

23.(42 – x) = 23

42 – x = 23: 23

42 – x = 1

x = 42 – 1

x = 41

Vậy x = 41

 x-(57-(42+(-23-x)=13-47+25-23-x

 x-57-42-23-x=13-47+25-23-x

 x-122-x=-32-x

 x-x-122=-32-x

 -32-x=-122

        x=-32-(-122)

        x=90

 Vậy x=90

\(x-(57-(42+(-23-x)=13-47+25-13-x\)

\(\Rightarrow x-57-42+\left(-23\right)-x=13-47+25-23-x\)

\(\Rightarrow x-x+x=13-47+25-23+23+42+57\)

\(\Rightarrow x=90\)