Question

1.Tính

2/7 + 5/7

8/15+6/15

2/3+3/9+4/9

giúp mình với mình đang cần gấp 

Answer 1

\(\frac{2}{7}+\frac{5}{7}=\frac{7}{7}=1\)

\(\frac{8}{15}+\frac{6}{15}=\frac{14}{15}\)

\(\frac{2}{3}+\frac{3}{9}+\frac{4}{9}=\frac{6}{9}+\frac{3}{9}+\frac{4}{9}=\frac{9}{9}+\frac{4}{9}=\frac{13}{9}\)

Answer 2

1,14/15,13/9,

Answer 3

2/7 + 5/7 = 7/7 = 1

8/15 + 6/15 = 14/15

2/3 + 3/9 + 4/9 = 6/9 + 3/9 + 4/9 = 13/9

Answer 4

1.\(\frac{2}{7}+\frac{5}{7}=\frac{2+5}{7}=\frac{7}{7}\)

2.\(\frac{8}{15}+\frac{6}{15}=\frac{8+6}{15}=\frac{14}{15}\)

Mk chỉ làm đc 2 câu đầu thôi