Tính bằng cách thuận tiện A, 6/8 x 24/12 x 2/3 B, 2/8 + 11/3 + 6/8 – 8/3

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1. $\text { Đáp án: }$

   ` a) `

   ` 6/8 × 24/12 × 2/3 `

   ` = 3/4 × 2 × 2/3 `

   ` = 3/4 × 4/3 `

   ` = 1 `

   ` b) `

   ` 2/8 + 11/3 + 6/8 – 8/3 `

   ` = ( 2/8 + 6/8 ) + ( 11/3 – 8/3 ) `

   ` = 1 + 1 `

   ` = 2 `

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2. Đáp án:

   $\text{ A, $\dfrac{6}{8}$ x $\dfrac{24}{12}$ x  $\dfrac{2}{3}$ }$

    $\text{= $\dfrac{24}{12}$ x ( $\dfrac{6}{8}$ x $\dfrac{2}{3}$) }$

   $\text{=  2 x $\dfrac{1}{2}$ }$

    $\text{= $\dfrac{2}{2}$ }$

   $\text{= 1 }$

   $\text{B $\dfrac{2}{8}$ + $\dfrac{11}{3}$ + $\dfrac{6}{8}$ – $\dfrac{8}{3}$ }$

    $\text{= ( $\dfrac{2}{8}$ + $\dfrac{6}{8}$) + ($\dfrac{11}{3}$ – $\dfrac{8}{3}$) }$

   $\text{ = 1 + 1 }$

   $\text{ = 2}$

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