a) $\frac{4}{5}$ – (-$\frac{2}{7}$) – $\frac{7}{10}$ b) $\frac{2}{3}$ – [(-$\frac{7}{4}$ – ($\frac{1}{2}$ + $\frac{3}{8}$)]

Bởi

a) $\frac{4}{5}$ – (-$\frac{2}{7}$) – $\frac{7}{10}$
b) $\frac{2}{3}$ – [(-$\frac{7}{4}$ – ($\frac{1}{2}$ + $\frac{3}{8}$)]

0 bình luận về “a) $\frac{4}{5}$ – (-$\frac{2}{7}$) – $\frac{7}{10}$ b) $\frac{2}{3}$ – [(-$\frac{7}{4}$ – ($\frac{1}{2}$ + $\frac{3}{8}$)]”

  1. a) 4/5 – ( -2/7 ) – 7/10

    =60/70 + 10/70 – 49/70

    = 21/70

    =3/10

    b) 2/3 – [( -7/4 – ( 1/2 + 3/8 )]

    = 2/3 – [( -7/4 – ( 4/8 + 3/8 )]

    = 2/3 – [ -7/4 – 7/8 ]

    = 2/3 – [ -14/8 – 7/8 ]

    = 2/3 – ( -21/8 )

    = 2/3 + 21/8

    = 16/24 + 63/24

    = 79/24

                                                    CHO MIK 5 SAO VÀ CTLHN NHA BẠN

     

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  2. $a$) `4/5 – (-2/7) – 7/10`

    `= 4/5 + 2/7 – 7/10`

    `= 56/70 + 20/70 – 49/70`

    `= {56+20-49}/70`

    `= 27/70`.

    $b$) `2/3 – [-7/4 – (1/2 + 3/8)]`

    `= 2/3 – (-7/4 – 1/2 – 3/8)`

    `= 2/3 – (-14/8 – 4/8 – 3/8)`

    `= 2/3 – {-21}/8`

    `= 16/24 – {-63}/24`

    `= 79/24`.

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