Giúp em với ạ Nhanh nhanh nhanh nhanh

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Giúp em với ạ
Nhanh nhanh nhanh nhanh

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    Bài `1`

    `a) 4/11 xx 8/17 + 4/11 xx 10/17 – 4/11`

    `= 4/11 xx 8/17 + 4/11 xx 10/17 – 4/11 xx 1`

    `= 4/11 xx (8/17 + 10/17 – 1)`

    `= 4/11 xx (8/17 +10/17 – 17/17)`

    `= 4/11 xx 1/17`

    `= 4/187`

    `b) 50/100 xx 2/13 + 1/2 xx 11/13`

    `= 1/2 xx 2/13 + 1/2 xx 11/13`

    `= 1/2 xx (2/13 + 11/13)`

    `= 1/2 xx 13/13`

    `= 1/2 xx 1`

    `= 1/2`

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