12A. Tính giá trị biểu thức a) 3/4 : ( 1/2 : 4/5 ) b) ( 11/9 : 22/27 ) . 3/4 c) ( 3/5 : 4/7 ) : ( 3/4 ; 3 ) d) ( 7/12 . 9/14 ) : ( 1/2 . 6/5 )

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1. `text{a}`, $\frac{3}{4}$ : ( $\frac{1}{2}$ : $\frac{4}{5}$ )

   = $\frac{3}{4}$ : $\frac{1}{4}$

   = $\frac{6}{5}$ 

   `text{b}`, ( $\frac{11}{9}$ : $\frac{22}{27}$ ) . $\frac{3}{4}$ 

   = $\frac{3}{2}$ . $\frac{3}{4}$

   = $\frac{9}{8}$  

   `text{c}`, ( $\frac{3}{5}$ : $\frac{4}{7}$ ) : ( $\frac{3}{4}$ : 3 )

   = $\frac{21}{20}$ : $\frac{1}{4}$ 

   = $\frac{21}{5}$ 

   `text{d}`, ( $\frac{7}{12}$ . $\frac{9}{14}$ ) : ( $\frac{1}{2}$ . $\frac{6}{5}$ )

   = $\frac{9}{4}$ : $\frac{3}{5}$ 

   = $\frac{5}{8}$

   ⇒ `text{Xin ctlhn}`

   @`text{HYen}`

   #`text{Sếu}`

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2. Đáp án + Giải thích các bước giải:

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

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

   `= \frac{3}{4}: \frac{5}{8}`

   `=\frac{3}{4}. \frac{8}{5}`

   `= \frac{6}{5}` 

   `b,( 11/9 : 22/27 ) . 3/4`

   `=(11/9 . 27/22). 3/4`

   `= 3/2 . 3/4`

   `=9/8`

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

   `= (3/5 . 7/4) : (3/4 . 1/3)`

   `=21/20 : 1/4`

   `=21/20 . 4`

   `=21/5`

   `d, ( 7/12 . 9/14 ) : ( 1/2 . 6/5 )`

   `= 3/8 : 3/5`

   `=3/8 . 5/3`

   `=5/8`

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