11B. Tính giá trị biểu thức a) 3/4 : ( 1/2 . 6/5 ) b) 4/7 + 6/7 : 3 – 3/8 c) ( 3/7 : 2/5 ) : 3/4 d) ( 7/12 . 9 /14 ) : 1/2

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1. Đáp án:

   `a) 3/4 : ( 1/2 . 6/5 )`

   `= 3/4 : 3/5`

   `= 3/4 . 5/3`

   `= 5/4`

   `b) 4/7 + 6/7 : 3 – 3/8`

   `= 4/7 + 6/7 . 1/3 – 3/8`

   `= 4/7 + 2/7 – 3/8`

   `= 6/7 – 3/8`

   `= 27/56`

   `c) ( 3/7 : 2/5 ) : 3/4`

   `= (3/7 . 5/2) : 3/4`

   `= 15/14 : 3/4`

   `= 15/14 . 4/3`

   `= 10/7`

   `d) ( 7/12 . 9 /14 ) : 1/2`

   `= 3/8 : 1/2`

   `= 3/8 . 2`

   `= 3/4`

    

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2. Tham khảo

    `a) \frac{3}{4}:(\frac{1}{2}.\frac{6}{5})`

   `=\frac{3}{4}:\frac{3}{5}`

   `=\frac{5}{4}`

   `b) \frac{4}{7}+\frac{6}{7}:3-\frac{3}{8}`

   `=\frac{4}{7}+\frac{2}{7}-\frac{3}{8}`

   `=\frac{6}{7}-\frac{3}{8}=\frac{27}{56}`

   `c) (\frac{3}{7}:\frac{2}{5}):\frac{3}{4}`

   `=\frac{15}{14}:\frac{3}{4}`

   `=\frac{10}{7}`

   `d) (\frac{7}{12}.\frac{9}{14}):\frac{1}{2}`

   `=\frac{3}{8}:\frac{1}{2}`

   `=\frac{3}{4}`

   `\text{©CBT}`

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