Question

[♕N҉G҉U҉Y҉ễN҉◇H҉O҉àN҉G҉◇L҉A҉N҉◇A҉N҉H...]

tính nhanh giá trị biểu thức :M= \(\frac{\frac{3}{5}+\frac{3}{7}-\frac{3}{11}}{\frac{4}{5}+\frac{4}{7}-\frac{4}{11}}\)

Answer 1

[Nguyễn Thị Ngọc Mai]

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

Answer 2

[Dương Thế Duy]

=3[1/5+1/7-1/11]

-----------------------     =3/4

  4[1/5+1/7-1/11]