Question

[an nguyên]

có ai bít làm bài 6.23, 6.24, 6.25 /SGK trang18 tập 2 ko

     giúp mình với

Answer 1

[Fiona]

6.23

a)\(\dfrac{-5}{3}\) - \(\dfrac{-7}{3}\)

=\(\dfrac{-5-\left(-7\right)}{3}\)

=\(\dfrac{2}{3}\)

b)\(\dfrac{5}{6}\)- \(\dfrac{8}{9}\) 

=\(\dfrac{5.3}{6.3}\)- \(\dfrac{8.2}{9.2}\)

=\(\dfrac{15}{18}\)-\(\dfrac{16}{18}\)

=\(\dfrac{-1}{18}\)

Answer 2

[Fiona]

6.24 

A=(-\(\dfrac{3}{11}\)) + \(\dfrac{11}{8}\) - \(\dfrac{3}{8}\) + (-\(\dfrac{8}{11}\))

= [ (-\(\dfrac{3}{11}\)) +  (-\(\dfrac{8}{11}\)) ] + ( \(\dfrac{11}{8}\) - \(\dfrac{3}{8}\) )

=\(\dfrac{-11}{11}\) + \(\dfrac{8}{8}\)

= -1 + 1

=0