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

    

   Trả lời

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`.

   Trả lời