Question

tính : 

a) (-2)+ -5/8

b) 5 + -3/4

c) 4/3 + (-6) 

d) (-8) - 2/7

e) -3/5 - 9 

g) 6- -4/13

Answer 1

`#` `\text{dkhanhqlv}`

`a)-2+(-5/8)`

`=-2-5/8`

`=-16/8-5/8`

`=-21/8`

`b)5+(-3/4)`

`=5-3/4`

`=20/4-3/4`

`=17/4`

`c)4/3+(-6)`

`=4/3-6`

`=4/3-18/3`

`=-14/3`

`d)-8-2/7`

`=-56/7-2/7`

`=-58/7`

`e)-3/5-9`

`=-3/5-45/5`

`=-48/5`

`g)6-(-4/13)`

`=6+4/13`

`=78/13+4/13`

`=82/13`

Answer 2

\(a,\left(-2\right)-\dfrac{5}{8}=-\dfrac{21}{8}\)

\(b,5+\left(-\dfrac{3}{4}\right)=5-\dfrac{3}{4}=\dfrac{20}{4}-\dfrac{3}{4}=\dfrac{17}{4}\)

\(c,\dfrac{4}{3}+\left(-6\right)=\dfrac{4}{3}-6=-\dfrac{14}{3}\)

\(d,\left(-8\right)-\dfrac{2}{7}=-\dfrac{58}{7}\)

\(e,-\dfrac{3}{5}-9=-\dfrac{48}{5}\)

\(g,6-\left(-\dfrac{4}{13}\right)=6+\dfrac{4}{13}=\dfrac{82}{13}\)

Answer 3

a) \(-2+\left(-\dfrac{5}{8}\right)=-\dfrac{16}{8}+\left(-\dfrac{5}{8}\right)=-\dfrac{21}{8}\)

b) \(5+\left(-\dfrac{3}{4}\right)=\dfrac{20}{4}+\left(-\dfrac{3}{4}\right)=\dfrac{17}{4}\)

c) \(\dfrac{4}{3}+\left(-6\right)=\dfrac{4}{3}+\left(-\dfrac{18}{3}\right)=-\dfrac{14}{3}\)

d) \(-8-\dfrac{2}{7}=-\dfrac{56}{7}-\dfrac{2}{7}=-\dfrac{58}{7}\)

e) \(-\dfrac{3}{5}-9=-\dfrac{3}{5}-\dfrac{45}{5}=-\dfrac{48}{5}\)

g) \(6-\left(-\dfrac{4}{13}\right)=6+\dfrac{4}{13}=\dfrac{78}{13}+\dfrac{4}{13}=\dfrac{82}{13}\)