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