Toán Lớp 6: tính nhanh 75.(-2 3/75+7 2/75-5 4/25)
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Toán Lớp 6: tính nhanh 75.(-2 3/75+7 2/75-5 4/25)
Comments ( 2 )
$\text{75 × ( -2$\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 × $\dfrac{-3}{25}$}$
$\text{= -9 }$
75 . (-2 3/75 + 7 2/75 – 5 4/25)
= 75 . (4 74/75 – 5 4/25)
= 75 . -13/75
= -13