Bài 2:Tính a)7/15 +4/5 -1/3 . b)2/3 -1/8 :1/3. c)4/5 ×5/8 – 1/4. d)1/2:(29/35 – 3/7 ).

Bài 2:Tính
a)7/15 +4/5 -1/3 .
b)2/3 -1/8 :1/3.
c)4/5 ×5/8 – 1/4.
d)1/2:(29/35 – 3/7 ).

0 bình luận về “Bài 2:Tính a)7/15 +4/5 -1/3 . b)2/3 -1/8 :1/3. c)4/5 ×5/8 – 1/4. d)1/2:(29/35 – 3/7 ).”

  1. `a) 7/15 + 4/5 – 1/3`

    `= 7/15 + 12/15 – 5/15`

    `= 19/15 – 5/15`

    `= 14/15`

    `b) 2/3 – 1/8 : 1/3`

    `= 2/3 – 1/8 × 3/1`

    `= 2/3 – 3/8`

    `= 16/24 – 9/24`

    `=7/24`

    `c) 4/5 × 5/8 – 1/4`

    `= 1/2 – 1/4`

    `= 2/4 – 1/4`

    `=1/4`

    `d) 1/2 : ( 29/35 – 3/7 )`

    `= 1/2 : ( 29/35 – 15/35 )`

    `= 1/2 : 2/5`

    `= 1/2 × 5/2`

    `= 5/4`

    $#Cho mik xin ctlhn.$

     

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