Question

Tính nhanh:

3/7 + 8/13 + 7/9 + 4/7 + 18/13 + 11/9

Ghi lời giải rõ ra nha!

Answer 1

= (3/7 + 4/7) + (8/13 + 18/13) + (7/9 + 11/9)

= 7/7 + 26/3 + 18/9

= 1 + 2+ 2

=5

Answer 2

=(3\7+4\7)+(8\13 +18|13)+(7\9+11\9)

=7\7+26\13+18\9

=1+2+2

=5

Answer 3

\(\frac{3}{7}+\frac{8}{13}+\frac{7}{9}+\frac{4}{7}+\frac{18}{13}+\frac{11}{9}\)

\(=\left(\frac{3}{7}+\frac{4}{7}\right)+\left(\frac{8}{13}+\frac{18}{13}\right)+\left(\frac{7}{9}\cdot\frac{11}{9}\right)\)

\(=1+2+2\)

\(=5\)

Answer 4

\(\frac{3}{7}+\frac{8}{13}+\frac{7}{9}+\frac{4}{7}+\frac{18}{13}+\frac{11}{9}\)

\(=\)\(\left(\frac{3}{7}+\frac{4}{7}\right)+\left(\frac{8}{13}+\frac{18}{13}\right)+\left(\frac{7}{9}+\frac{11}{9}\right)\)

\(=\) \(\frac{7}{7}+\frac{26}{13}+\frac{18}{9}\)

\(=\) \(1+2+2\)

\(=\) \(5\)