TÍNH : 7)2/3+1/3:(-5)/9 8) 4/5-3/5. 15/4 9) 1/5: (-7)/15-(-2)/7 10) 5/6 -2/3 +1/4 11) 5/15-(-4)

1 bình luận về “TÍNH : 7)2/3+1/3:(-5)/9 8) 4/5-3/5. 15/4 9) 1/5: (-7)/15-(-2)/7 10) 5/6 -2/3 +1/4 11) 5/15-(-4)”

1. 7) 2/3 + 1/3 : (-5)/9
   = 2/3 + 1/3 . -9/5
   = 2/3 – 3/5
   = 1/15

   8) 4/5 – 3/5 . 15/4
   = 4/5 – 9/4
   = 16/20 – 45/20
   = -29/20

   9) 1/5 : -7/15 – (-2/7)
   = 1/5 . -15/7 + 2/7
   = -3/7 + 2/7
   = -1/7

   10) 5/6 – 2/3 + 1/4
   = 10/12 – 8/12 + 3/12
   = 5/12

   11) 5/15 – (-4/20) – 9/36
   = 1/3 + 1/5 – 1/4
   = 20/60 + 12/60 – 15/60
   = 17/60

    

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