mờ gì mk thấy rõ rùi
nhưng mk ko biết làm cậu biết thì giúp cậu ấy đi
Bài 2: a) \(\left(\dfrac{-1}{2}\right)^2.\dfrac{1}{4}-2.\left(\dfrac{-1}{2}\right)^2\)
\(\Leftrightarrow\left(\dfrac{-1}{2}\right)^2.\left(\dfrac{1}{4}-2\right)\)
\(=\dfrac{1}{4}.\dfrac{-7}{4}=\dfrac{-7}{16}\)
Bài 1:
a) \(\dfrac{4}{9}.\left(4\dfrac{1}{3}+13\dfrac{2}{3}\right)\)
b)\(\dfrac{3}{8}.\left(5\dfrac{1}{4}+10\dfrac{3}{4}\right)\)
c)\(\left(-\dfrac{2}{7}\right).\left(6\dfrac{1}{4}+14\dfrac{4}{5}\right)\)
d)\(\dfrac{-7}{6}.\left(7\dfrac{1}{6}+10\dfrac{5}{6}\right)\)