(-2/3) mũ 2 : 2/3 1/3 . 2/7 + 1/3 . 3/5 -5/16 . -18/5 + 4/9

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1. Giải thích các bước giải:

   `(-2/3)^2 :2/3`
   `=(2/3)^2:2/3`
   `=(2/3)^(2-1)`
   `=2/3`
   `1/3 .2/7+1/3 . 3/5`
   `=1/3 . (2/7+3/5)`
   `=1/3 . (10/35+21/35)`
   `=1/3 . 31/35`
   `=31/105`
   `-5/16 . (-18)/5+4/9`
   `=5/16 . 18/5+4/9`
   `=18/16+4/9`
   `=9/8+4/9`
   `=81/72+32/72`
   `=113/72`

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2. `(-2/3)^2 : 2/3`

   `= (-2)^2/3^2 . 3/2`

   `= 4/9 . 3/2`

   `=2/3`

   `1/3 . 2/7 + 1/3 . 3/5`

   `= 1/3(2/7 + 3/5)`

   `= 1/3 ( 10/35 + 21/35)`

   `=1/3. 31/35`

   `=31/105`

   `-5/16 . (-18/5) + 4/9`

   `= 9/8 + 4/9`

   `= 81/72+ 32/72`

   `=113/72`

    

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