( - 7² ) . ( - 23 + 2x ) = ( - 49 ) . ( - 23 + 14 )

( - 7² ) . ( - 23 + 2x ) = ( - 49 ) . ( - 9 )

( - 7² ) . ( - 23 + 2x ) = 441

- 49 . ( - 23 + 2x ) = 441

- 23 + 2x = 441 : ( - 49 )

- 23 + 2x = - 9

          2x = - 9 - ( - 23 )

          2x = 14

            x = 14 : 2

            x = 7

\(49\dfrac{8}{23}-\left(5\dfrac{7}{32}+14\dfrac{8}{23}\right)=49\dfrac{8}{23}-5\dfrac{7}{32}-14\dfrac{8}{23}=\left(49\dfrac{8}{23}-14\dfrac{8}{23}\right)-5\dfrac{7}{32}=35-5\dfrac{7}{32}=\dfrac{953}{32}\)

kết quả là 16 nha bạn

49. (-23 + 2.x) = (-49).(-23 + 14)

49. (-23 + 2.x) = (-49). (-9)

49. (-23 + 2.x) = 441

     -23 + 2.x = 441 : 49

     -23 + 2.x = 9

             2.x = 9 - (-23)

            2.x = 32

              x = 32 : 2

              x = 16

đáp số: 16

giải

49/8/23-(5/7/32+14/8/23)

=49/8/23-5/7/32-14/8/23

=(49/8/23-14/8/23)-5/7/32

=35-5/7/32

=953/32

1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)

\(=2155-174-2155-68+174\)

=-68

2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)

\(=-25\cdot\left(72-21+49\right)\)

\(=-25\cdot100=-2500\)

\(A=\frac{1135}{23}-\left(\frac{167}{32}+\frac{330}{23}\right)=\frac{1135}{23}-\frac{330}{23}+\frac{167}{32}=35+\frac{167}{32}=\frac{1287}{32}\)

49\(\frac{8}{23}\) - (5\(\frac{7}{32}\) + 14\(\frac{8}{23}\) )

= \(\frac{1135}{23}\) - (\(\frac{167}{32}\) +\(\frac{330}{23}\) )

= \(\frac{1135}{23}\) - \(\frac{14401}{736}\) 

=\(\frac{953}{32}\)

\(49\frac{8}{23}-\left(5\frac{7}{32}+14\frac{8}{23}\right)\)

\(=\frac{1135}{23}\left(\frac{135}{32}+\frac{330}{23}\right)\)

\(=\frac{1135}{23}.\frac{13665}{736}\)

\(=916,2201678\)

=1135/23-(167/32+330/23)

=(1135/23-330/23)-167/32

=35-167/32

=1120/32-167/32

=953/32

=hỗn số 29:25/32