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\(\dfrac{1}{2}.\)\(\dfrac{3}{5}+\dfrac{4}{7}:\dfrac{4}{5}-\dfrac{1}{70}\)

\(\left(\dfrac{2}{3}+\dfrac{1}{5}-\dfrac{4}{9}\right):\left(\dfrac{1}{3}+\dfrac{2}{5}-\dfrac{6}{9}\right)\)

lộn :))

9 giờ 12 phút

\(\dfrac{2}{5}.\)\(\dfrac{5}{7}\)\(+\dfrac{3}{5}:\dfrac{3}{7}-\dfrac{2}{35}\)

1)fan 

2) Marie Curie

3)James Watt.

4)tiếng anh

5)connan 

6) Edison 

\(\dfrac{-1}{12}+\dfrac{4}{-15}+\dfrac{6}{40}\)