a)3/5-3/4 b)1/7 . -3/8+1/7.-13/8 c)-15/4.(7/10-3/5) d)-22/17.23/33+-22/17.10/33+ 2 5/7

2 bình luận về “a)3/5-3/4 b)1/7 . -3/8+1/7.-13/8 c)-15/4.(7/10-3/5) d)-22/17.23/33+-22/17.10/33+ 2 5/7”

1. a) 3/5 – 3/4

   = 12/20 – 15/20

   = -3/20

   b) 1/7 . (-3/8) + 1/7 . (-13/8)

   = 1/7 . (-3/8 + (-13)/8)

   = 1/7 . (-2)

   = -2/7

   c) -15/4 . (7/10 – 3/5)

   = -15/4 . (7/10 – 6/10)

   = -15/4 . 1/10

   = -3/8

   d) -22/17 . 23/33 + (-22)/17 . 10/33 + 2 5/7

   = -22/17 . (23/33 + 10/33) + 2 5/7

   = -22/17 + 19/7

   = 169/119

   Trả lời
2. Giải đáp:

   a) 3/5 – 3/4

   = 12/20 – 15/20

   = -3/20

   b) 1/7 . (-3/8) + 1/7 . (-13/8)

   = 1/7 . (-3/8 – 13/8)

   = 1/7 . (-16/8)

   = 1/7 . (-2)

   = -2/7

   c) -15/4 . (7/10 – 3/5)

   = -15/4 . (7/10 – 6/10)

   = -15/4 . 1/10

   = -15/40

   = -3/8

   d) -22/17 . 23/33 + (-22/17) . 10/33 + 2 5/7

   = -22/17 . (23/33 + 10/33) + 19/7

   = -22/17 . 1 + 19/7

   = -22/17 + 19/7

   = 169/119

    

    

   Trả lời