Bài 1:
\(a,\dfrac{4}{9}:\left(-\dfrac{1}{7}\right)+6\dfrac{5}{9}.\dfrac{2}{3}.\\ =\dfrac{-28}{9}+\dfrac{59}{9}.\dfrac{2}{3}=\dfrac{-28}{9}+\dfrac{118}{27}=\dfrac{34}{27}.\\ b,\left(\dfrac{-1}{3}\right)^2.\dfrac{4}{11}+\dfrac{7}{11}.\left(-\dfrac{1}{3}\right)^2.\\ =\left(\dfrac{-1}{3}\right)^2\left(\dfrac{4}{11}+\dfrac{7}{11}\right)=\dfrac{1}{9}.\)
Bài 3:
\(a,\left(\dfrac{1}{3}-\dfrac{5}{6}\right)^2+\dfrac{5}{6}:2.\\ =\left(-\dfrac{1}{2}\right)^2+\dfrac{5}{12}.\\ =\dfrac{1}{4}+\dfrac{5}{12}=\dfrac{2}{3}.\\ b,5,7+3,6-3\left(1,2-2,8\right).\\ =5,7+3,6-3,6+8,4.\\ =14,1.\):
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