Thực hiện phép tính về phân số: a) -1/8+7/9+-7/9+6/7+2/14 b) 1/28+-1/4+3/28+1/7+-5/28+3/14+-1/4 (Tính nhan nếu có thể,giúp mìn với mn ơi)

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Thực hiện phép tính về phân số: a) -1/8+7/9+-7/9+6/7+2/14 b) 1/28+-1/4+3/28+1/7+-5/28+3/14+-1/4
(Tính nhan nếu có thể,giúp mìn với mn ơi)

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    `a, -1/8+7/9+(-7)/9+6/7+2/14`

    `=-1/8 +(7/9-7/9)+(6/7+1/7)`

    `=-1/8 +0+ 1`

    `=8/8-1/8`

    `=7/8`

    —————————————————————-

    `b, 1/28+(-1)/4+3/28+1/7+(-5)/28+3/14+(-1)/4`

    `=(1/28+3/28-5/28)-(1/4+1/4)+(1/7+3/14)`

    `=-1/28-1/2+(2/14+3/14)`

    `=-1/28-1/2+5/14`

    `=-1/28 -14/28+10/28`

    `=-5/28`

     

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