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82 - ( 15 + x ) = 92
15 + x = 82 - 92
15 + x = -10
x = ( -10 ) - 15
x = -25
82 - ( 15 + x ) = 92
15 + x = 82 - 92
15 + x = - 10
x = - 10 - 15
x = - 25
Vậy x = - 25
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\(\dfrac{92}{6}\times\dfrac{72}{15}:\left(-\dfrac{72}{10}\right)\)
\(=\dfrac{92\times72}{6\times15}:\left(-\dfrac{72}{10}\right)\)
\(=\dfrac{368}{5}:\left(-\dfrac{72}{10}\right)\)
\(=\dfrac{368}{5}\times\dfrac{-10}{72}\)
\(=\dfrac{368\times\left(-10\right)}{5\times72}\)
\(=\dfrac{-92}{9}\)
\(=\dfrac{92}{6}\cdot\dfrac{72}{15}\cdot\dfrac{-10}{72}=\dfrac{92}{6}\cdot\dfrac{-2}{3}=\dfrac{-92}{9}\)
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x - ( 81 + 5x ) = 19
=> x - 81 - 5x = 19
=> ( x - 5x ) - 81 = 19
=> -4x = 19 + 81
=> -4x = 100
=> x = 100 : ( -4 )
=> x = -25
2x - ( 8 + 3x ) = 92
=> 2x - 8 - 3x = 92
=> ( 2x - 3x ) = 8 + 92
=> -x = 100
=> x = -100
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Đáp án là D
Ta có: 3 4 .6 - [131 - 15 - 9 2 ] = 3 4 .6 - [131 - 6 2 ]
= 81.6 - [131 - 36] = 81.6 - 95
= 486 - 95 = 391
=(-15)*100+1150
=-1500+1150
=-350
(-15).92+(-15).8+1150
=-15.(92+8)+1150
=-15.100+1150
=-1500+1150
=-350