a,(40/51.0,32.17/20):64/75 b,-12/7.15+2/7.(-15)+(-105).(2/3-4/5+1/7)

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1. a,(40/51.0,32.17/20):64/75

   =(40/51.8/25.17/20):64/75

   =   16/75:64/74

   =        1/4

   b,-12/7.15+2/7.(-15)+(-105).(2/3-4/5+1/7)

   = 15.(-12/7-2/7)+(-105).1/105

   = 15.(-2)+(-105).1/105

   = -30+(-1)

   =      -31

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2. a,(40/51 . 0,32. 17/20) : 64/75

   = 16/75 : 64/75

   = 1/4 (0,25)

   b,-12/7 . 15 + 2/7. (-15) + (-105) . (2/3 – 4/5 + 1/7)

   = -12/7 . 15 + 2/7. (-15) + (-105) . 1/105

   =-180/7 + (-30/7) + (-1) 

   = -31

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