$\frac{2}{3}$+$\frac{1}{3}$.($\frac{-4}{9}$+$\frac{5}{6}$):$\frac{7}{12}$

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1. `2/3 + 1/3 . ( ( – 4 )/9 + 5/6 ) : 7/12`

   `= 2/3 + 1/3 . ( ( – 8 )/18 + 15/18 ) : 7/12`

   `= 2/3 + 1/3 . 7/8 : 7/12`

   `= 2/3 + 7/24 xx 12/7`

   `= 2/3 + 1/2`

   `= 4/6 + 3/6`

   `= 7/6`   

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   `0,25 . 1 1/3 . 50% : 7/6 + 3/2`
   `= 1/4 . 4/3 . 1/2 xx 6/7 + 3/2`
   `= 1/3 . 1/2 xx 6/7 + 3/2`
   `= 1/6 . 6/7 + 3/2`
   `= 1/7 + 3/2`
   `= 2/14 + 21/14`
   `= 23/14`

    

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2. Đáp án+Giải thích các bước giải:

   Câu 1:

    `2/3+1/(3).((-4)/9+5/6):7/12`

   `=2/3+1/(3).((-8)/18+15/18):7/12`

   `=2/3+1/(3).((-8+15)/18):7/12`

   `=2/3+1/3.(7)/18:7/12`

   `=2/3+1/3.(7)/18.(12)/7`

   `=2/3+(1.7.12)/(3.18.7)`

   `=2/3+(1.12)/(3.18)`

   `=2/3+(2.3.2)/(3.2.9)`

   `=2/3+2/9`

   `=6/9+2/9`

   `=8/9`

   Câu 2:

   `0,25.1(1)/(3).50%:7/6+3/2`

   `=1/4.(4)/3.(1)/2:7/6+3/2`

   `=1/3.(1)/2:7/6+3/2`

   `=1/6.(6)/7+3/2`

   `=1/7+3/2`

   `=2/14+21/14`

   `=23/14`

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