Tính a.4/11+ -5/13+7/11- 8/13 +1/2 b.1/3-2/3÷4/3 c.1/4-(3/8+ 1/4+5/2)÷2/3

Tính
a.4/11+ -5/13+7/11- 8/13 +1/2
b.1/3-2/3÷4/3
c.1/4-(3/8+ 1/4+5/2)÷2/3

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  1. a, 4/11+ -5/13+7/11- 8/13 +1/2

     =4/11+7/11+-5/13-8/13 +1/2

     = 1+(-1) +1/2

     =1/2

    b, 1/3-2/3÷4/3

      =1/3-1/2

     =-1/6

    c,

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  2. Đáp án:

     a,`4/11 – 5/13 + 7/11 -8/13 + 1/2`

    `=(4/11 + 7/11) -(5/13 + 8/13) +1/2`

    `=1-1 +1/2=1/2`

    b, `1/3 – 2/3 : 4/3`

    `=1/3 – 2/3 xx 3/4`

    `=1/3 – 1/2 `

    `=2/6-3/6=-1/6`

    c,`1/4 -(3/8 + 1/4 + 5/2) : 2/3`

    `=1/4 – (3/8 + 2/8 + 20/8) xx 3/2`

    `=1/4 – 25/8 xx 3/2`

    `=1/4 – 75/16`

    `=4/16-75/16`

    `=-71/16`

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