6- 5 1/3 +3 1/3 7/12 – 3 1/5+1 5/12+ 4 1/5

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1. Đáp án:

   `a)2 2/3.`

   `b)3.`

   Giải thích các bước giải:

   `a)6-5 1/3+3 1/3.`

   `=18/3-16/3+10/3.`

   `=(18-16+10)/3.`

   `=8/3.`

   `=2 2/3.`

   `b)7/12-3 1/5+1 5/12+4 1/5.`

   `=7/12-16/5+17/12+21/5.`

   `=(7/12+17/12)+(-16/5+21/5).`

   `=(7+17)/12+(-16+21)/5.`

   `=24/12+5/5.`

   `=2+1.`

   `=3.`

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2. `\text{Đáp án:}`

   `a)` $\dfrac{8}{3}$

   `b)` `3`

   `\text{Giải thích các bước giải:}`

   `a)` `6` – `5`$\dfrac{1}{3}$ + `3`$\dfrac{1}{3}$

   = $\dfrac{18}{3}$ – $\dfrac{16}{3}$ + $\dfrac{10}{3}$

   = $\dfrac{8}{3}$

   `b)` $\dfrac{7}{12}$ – `3`$\dfrac{1}{5}$ + `1`$\dfrac{5}{2}$ + `4`$\dfrac{1}{5}$

   = $\dfrac{7}{12}$ – $\dfrac{16}{5}$ + $\dfrac{17}{12}$ + $\dfrac{21}{5}$

   =  $\dfrac{7}{12}$ + $\dfrac{-16}{5}$ + $\dfrac{17}{12}$ + $\dfrac{21}{5}$

   = `(`$\dfrac{7}{12}$ + $\dfrac{17}{12}$`)` + `(`$\dfrac{-16}{5}$ + $\dfrac{21}{5}$`)`

   = $\dfrac{24}{12}$ + $\dfrac{5}{5}$

   = `2` +`1`

   = `3`

   `\text{#Chúc bạn học tốt!}`

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