\(\frac{8}{27}+\frac{4}{15}+\frac{19}{27}+\frac{11}{15}\)

\(=\left(\frac{8}{27}+\frac{19}{27}\right)+\left(\frac{4}{15}+\frac{11}{15}\right)\)

\(=\frac{27}{27}+\frac{15}{15}\)

\(=1+1=2\)

8/27+4/15+19/27+11/15

=(8/27+19/27)+(4/15+11/5)

=27/27+15/15

=1+1

=2

\(\frac{8}{27}+\frac{4}{15}+\frac{19}{27}+\frac{11}{15}\)

\(=(\frac{8}{27}+\frac{19}{27})+(\frac{4}{15}+\frac{11}{15})\)

\(=1+1=2\)

=(8/27+19/27)+(4/15+11/15)

=27/27+15/15

=1+1

=2

\(\frac{8}{27}+\frac{4}{15}+\frac{19}{27}+\frac{11}{15}\)

\(=\left(\frac{8}{27}+\frac{19}{27}\right)+\left(\frac{4}{15}+\frac{11}{15}\right)\)

\(=1+1=2\)

        \(\frac{8}{27}+\frac{4}{15}+\frac{19}{27}+\frac{11}{15}\)

\(=\left(\frac{8}{27}+\frac{19}{27}\right)+\left(\frac{4}{15}+\frac{11}{15}\right)\)

\(=1+1\)

\(=2\)

2

3

8/27+4/15+19/27+11/15

=(8/27+19/27)+(4/15+11/5)

=27/27+15/15

=1+1

=2

12/13 + 2/7 + 8/13 + 6/13 + 5/7

= ( 2/7 + 5/7 ) + ( 12/13 + 8/13 + 6/13 )

= 1 + 2

= 3

2

3

a: =(8/27+19/27)+(4/15+11/15)=1+1=2

b: =(12/13+8/13+6/13)+(2/7+5/7)=2+1=3

8/27+4/5+19/27+11/15=(8/27+19/27) + (4/5+11/15)

                                    = 1+ (12/15+11/15)

                                    = 1+ 1/8/15=2/8/15

12/13+2/7+8/13+6/13+5/7=(12/13+8/13+6/13) + (2/7+5/7)

                                         = 2+ 1

                                         =3

Ý a có thể bạn chép nhầm 4/5 rồi

= 2 + 1=3 nhé bạn

ghi lại đoàn hoàn đc hăm :)?

2: \(=\dfrac{-2}{75}+\dfrac{5}{39}=\dfrac{33}{325}\)

3: \(=\dfrac{6}{11}\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{6}{11}\)

4: \(=\dfrac{7}{19}\left(\dfrac{5}{13}+\dfrac{8}{13}-1\right)=-2\cdot\dfrac{7}{19}=-\dfrac{14}{19}\)

5: \(=\dfrac{2}{7}\left(\dfrac{4}{23}-\dfrac{27}{23}+1\right)=0\)

6: \(=\dfrac{3}{8}\left(\dfrac{3}{7}+\dfrac{4}{7}\right)+\dfrac{11}{8}=\dfrac{3}{8}+\dfrac{11}{8}=\dfrac{14}{8}=\dfrac{7}{4}\)