Bài 1: a) 3/5+5/3-(-1/2)+1/-4 b)1/15+9/10+14/15-1/9-20/10+1/157 c) 1/3-3/4-(-3/5)+1/12-2/9-1/36+1/15 d)1/1.2+1/2.3+1/4.5+1/5.6+1/6.7 Bài 2: Tìm X 4/3-

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1. Đáp án:

    

   Giải thích các bước giải:

    

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2. bài 1

   a) 3/5+5/3-(-1/2)+1/-4

   =3/5+5/3+1/2-1/4

   =34/15+1/4

   =151/60

   b) 1/15+9/10+14/15-1/9-20/10+1/157

   =  (1/15+14/15)+(9/10-20/10)+1/157-1/9

   = 1-11/10-1/9+1/157

   =-2893/14130

   c) 1/3-3/4-(-3/5)+1/12-2/9-1/36+1/15

   = 1/3-3/4+3/5+1/12-2/9-1/36+1/15

   =1/12

   d)1/1.2+1/2.3+1/4.5+1/5.6+1/6.7

   =1/2+1/6+1/20+1/30+1/42

   =65/84

   bài 2

   4/3-(x-1/5) = 3/10+1/2-1/6

   4/3-(x-1/5) =19/30

          (x-1/5) =4/3-19/30

          (x-1/5) =7/10

           x          =7/10+1/5

           x          = 9/10

   vậy x = 9/10

   HỌC TỐT !!!

   XIN CTLHN NHA!!!

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