\(a;\dfrac{x}{6}=\dfrac{21}{18}\)
\(\Rightarrow x.18=21.6\)
\(\Rightarrow x.18=126\)
`=> x = 126 : 18`
`=> x = 7`
Vậy `x = 7`
\(b,\dfrac{-5}{x}=\dfrac{40}{64}\)
`=> (-5)/x = 5/8`
`=> 5x = -5 . 8`
`=> 5x = -40`
`=> x = -40 : 5`
`=> x =-8`
Vậy `x =-8`
`c,`
\(\dfrac{23}{18}=\dfrac{x}{-72}\)
\(\Rightarrow23.-72=x.18\)
`=> -1656 = x . 18`
`=> x = -1656 : 18`
`=> x =-92`
Vậy `x =-92`
`d,`
\(\dfrac{-25}{17}=\dfrac{75}{x}\)
\(\Rightarrow-25.x=75.17\)
`=> -25x = 1275`
`=> x = 1275 : -25`
`=> x = -51`
Vậy ` x =-51`
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