A = (6- 2 4/5).3 1/8 – 1 3/5:1/4 B = (-5/4 – -3/4 + 7/12) : 20% – 1/5

A = (6- 2 4/5).3 1/8 – 1 3/5:1/4
B = (-5/4 – -3/4 + 7/12) : 20% – 1/5

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  1. Đáp án:

    A = (6- 2 4/5).3 1/8 – 1 3/5:1/4

    A=(30-24/5).31/8-13/5.4

    A=6/5.31/8-13/20

    A=93/20-13/20

    A=80/20=4

    B= (-5/4 – -3/4 + 7/12) : 20% – 1/5

    B=(-1/2+7/12):1/5-1/5

    B=(-6/12+7/12) x 5 – 1/5

    B=1/12   .5-1/5

    B=5/12-12/60

    B=25-12/60

    B=13/60

    Giải thích các bước giải:

    A = (6- 2 4/5).3 1/8 – 1 3/5:1/4

    A=(30-24/5).31/8-13/5.4

    A=6/5.31/8-13/20

    A=93/20-13/20

    A=80/20=4

    B= (-5/4 – -3/4 + 7/12) : 20% – 1/5

    B=(-1/2+7/12):1/5-1/5

    B=(-6/12+7/12) x 5 – 1/5

    B=1/12   .5-1/5

    B=5/12-12/60

    B=25-12/60

    B=13/60

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