Question

[ミ★FF BӨYΛΉΉ★彡]

Tính nhanh :

\(\frac{1}{5}\times\frac{1}{7}+\frac{4}{5}+\frac{1}{5}\times\frac{12}{7}-1-\frac{1}{5}\times\frac{6}{7}\).

Answer 1

[I don't need you]

\(\frac{1}{5}\cdot\frac{1}{7}+\frac{4}{5}+\frac{1}{5}\cdot\frac{12}{7}-1-\frac{1}{5}\cdot\frac{6}{7}\)

\(=\frac{1}{5}\cdot\left(\frac{1}{7}+\frac{12}{7}-\frac{6}{7}\right)-\left(1-\frac{4}{5}\right)\)

\(=\frac{1}{5}.1-\frac{1}{5}\)

\(=\frac{1}{5}-\frac{1}{5}=0\)