Nhanh ạ Ai nhanh nhất đc ctlhn

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Nhanh ạ
Ai nhanh nhất đc ctlhn

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    Đáp án+Giải thích các bước giải:

     Bài `3:`

    `a)`

    `4/3 xx 3/7+4/7: 8/7- 1/7`

    `=\frac{4xx3}{3xx7}+4/7 xx 7/8 -1/7`

    `=4/7 +\frac{4xx7}{7xx8}-1/7`

    `=(4/7-1/7)+4/8`

    `=3/7+1/2`

    `=6/14+7/14`

    `=\frac{6+7}{14}`

    `=13/14`

    `b)`

    `2/5: 4/5+1:3/4+1/2`

    `=2/5xx 5/4+1 xx 4/3+1/2`

    `=\frac{2xx5}{5xx4}+4/3+1/2`

    `=2/4+4/3+1/2`

    `=(1/2+1/2)+4/3`

    `=2/2+4/3`

    `=1+4/3`

    `=3/3+4/3`

    `=7/3`

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