tính nhanh 75.(-2 3/75+7 2/75-5 4/25)

$\text{75 × ( -2$\dfrac{3}{75}$ + 7$\dfrac{2}{25}$ - 5$\dfrac{4}{25}$ ) }$

$\text{= 75 × ( -2$\dfrac{1}{25}$ + 7$\dfrac{2}{25}$ - 5$\dfrac{4}{25}$ ) }$

$\text{= 75 × [( -2 + 7 - 5 ) + ( $\dfrac{-1}{25}$ + $\dfrac{2}{25}$ - $\dfrac{4}{25}$ ) }$

$\text{= 75 × $\dfrac{-3}{25}$}$

$\text{= -9 }$