Question

Tính nhanh:

\(\frac{3}{7}\)x \(\frac{4}{11}\)+\(\frac{3}{7}\) x \(\frac{5}{11}\)+ \(\frac{1}{2}\)

Answer 1

Ta có ; \(\frac{3}{7}\times\frac{4}{11}+\frac{3}{7}\times\frac{5}{11}+\frac{1}{2}\)

\(=\frac{3}{7}\times\left(\frac{4}{11}+\frac{5}{11}\right)+\frac{1}{2}\)

\(=\frac{3}{7}\times\frac{9}{11}+\frac{1}{2}\)

\(=\frac{27}{77}+\frac{1}{2}\)

\(=\frac{131}{154}\)

Answer 2

\(\frac{3}{7}\times\left(\frac{4}{11}+\frac{5}{11}\right)+\frac{1}{2}\)

\(=\frac{3}{7}\times\frac{9}{11}+\frac{1}{2}\)

\(=\frac{27}{77}+\frac{1}{2}\)

\(=\frac{131}{154}\)

Answer 3

\(\frac{3}{7}\times\frac{4}{11}+\frac{3}{7}\times\frac{5}{11}+\frac{1}{2}\)

\(=\frac{3}{7}\times\left(\frac{4}{11}+\frac{5}{11}\right)+\frac{1}{2}\)

\(=\frac{3}{4}\times\frac{9}{11}+\frac{1}{2}\)

\(=\frac{27}{77}+\frac{1}{2}\)

\(=\frac{54}{154}+\frac{77}{154}\)

\(=\frac{131}{154}\)