bài 1 a) 1/2 . ( 4/3+ 2/5) – 3/4 (8/9+16/3) b)1/5:1/10 – 1/3 ( 6/5 – 9/4) c) 1/7:5/14 – 3/2 . (1/6 – 7/12) d)-5/4:(1/4- 7/8)

1 bình luận về “bài 1 a) 1/2 . ( 4/3+ 2/5) – 3/4 (8/9+16/3) b)1/5:1/10 – 1/3 ( 6/5 – 9/4) c) 1/7:5/14 – 3/2 . (1/6 – 7/12) d)-5/4:(1/4- 7/8)”

1. Cii

   a)1/2.(4/3+2/5)-3/4  .  (8/9+16/3)

   =1/2  .  26/15-3/4  .  56/9

   =13/15-14/3

   =-19/5

   b)1/5:1/10-1/3  .  (6/5-9/4)

   =2-1/3  .  (-21/20)

   =2-(-7/20)

   =47/20

   c)1/7:5/14-3/2  .  (1/6-7/12)

   =2/5-3/2  .  (-5/12)

   =2/5-(-5/8)

   =41/40

   d)(-5/4):(1/4-7/8)+3/2  .  (1/3-5/6)

   =(-5/4):(-5/8)+3/2  .  (-1/2)

   =2+(-3/4)

   =5/4

   e)(-7/8):21/16-5/3  .  (1/5-7/10)

   =(-2/3)-5/3  .  (-1/2)

   =(-2/3)-(-5/6)

   =1/6

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