a) 6/7+(2/11-6/7) b) 83/5.(-1/3) – 68/5.(-1/3)+3/4 c) 5/8+(6/11-5/8) d) 3/7.(3/2-0,5) : (-3)^2

0 bình luận về “a) 6/7+(2/11-6/7) b) 83/5.(-1/3) – 68/5.(-1/3)+3/4 c) 5/8+(6/11-5/8) d) 3/7.(3/2-0,5) : (-3)^2”

1. Đáp án:

    a)2/11

   b)-1/4

   c)6/11

   d)1/21

   Giải thích các bước giải:

   a) 6/7+(2/11-6/7)

   =6/7 +2/11-6/7

   =2/11

   b) 83/5.(-1/3) – 68/5.(-1/3)+3/4

   =-1/3.(83/5-68/5) +3/4

   =-1/3.3 +3/4 =-1+3/4

   =-1/4

   c) 5/8+(6/11-5/8)

   =5/8 +6/11 -5/8

   =6/11

   d) 3/7.(3/2-0,5) : (-3)^2

   =3/7.(3/2 -1/2) :9

   =3/7 .1  :9

   =3/7:9

   =1/21

   Bình luận

2. $a$) `6/7 + (2/{11} – 6/7)`

   `= 6/7 + 2/{11} – 6/7`

   `= 2/{11}`

   $b$) `{83}/5 . (-1/3) – {68}/5 . (-1/3) + 3/4`

   `= -1/3. {83-68}/5 + 3/4`

   `= -1/3 . {15}/5 + 3/4`

   `= -1/3 . 3 + 3/4`

   `= -1 + 3/4`

   `= -1/4`

   $c$) `5/8+(6/{11}-5/8)`

   `= 5/8 + 6/{11} – 5/8`

   `= 6/{11}`

   $d$) `3/7 . (3/2 – 0,5) : (-3)^2`

   `= 3/7 . (3/2 – 1/2) : 9`

   `= 3/7 . 1 : 9`

   `= 3/7 . 1/9`

   `= 1/{21}`

   Bình luận