Tinh : (-7^2 ).(-23+2x)=(-49).(-23+14)
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\(49\dfrac{8}{23}-\left(5\dfrac{7}{32}+14\dfrac{8}{23}\right)=49\dfrac{8}{23}-5\dfrac{7}{32}-14\dfrac{8}{23}=\left(49\dfrac{8}{23}-14\dfrac{8}{23}\right)-5\dfrac{7}{32}=35-5\dfrac{7}{32}=\dfrac{953}{32}\)
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
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\(\frac{8}{23}\) )
= \(\frac{1135}{23}\) - (\(\frac{167}{32}\) +\(\frac{330}{23}\) )
= \(\frac{1135}{23}\) - \(\frac{14401}{736}\)
=\(\frac{953}{32}\)
\(49\frac{8}{23}-\left(5\frac{7}{32}+14\frac{8}{23}\right)\)
\(=\frac{1135}{23}\left(\frac{135}{32}+\frac{330}{23}\right)\)
\(=\frac{1135}{23}.\frac{13665}{736}\)
\(=916,2201678\)
( - 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