Question

[Trần Khánh Hiền]

tính nhanh biểu thức :

M=3/5+3/7-3/11 chia (:) 4/5 + 4/7-4/11

Answer 1

[Le Van Duc]

Ta có

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

\(M=\frac{3}{4}\)

Answer 2

\(M=\frac{\frac{3}{5}+\frac{3}{7}-\frac{3}{11}}{\frac{4}{5}+\frac{4}{7}-\frac{4}{11}}\)

\(M=\frac{3.\left(\frac{1}{5}+\frac{1}{7}-\frac{1}{11}\right)}{4.\left(\frac{1}{5}+\frac{1}{7}-\frac{1}{11}\right)}=\frac{3}{4}\)

Vậy : \(M=\frac{3}{4}\)