Bài 34:
\(a.X.\dfrac{1}{2}=\dfrac{1}{3}\)
\(X=\dfrac{1}{3}:\dfrac{1}{2}\)
\(X=\dfrac{2}{3}\)
\(b.X:\dfrac{4}{5}=\dfrac{5}{2}\)
\(X=\dfrac{5}{2}.\dfrac{4}{5}\)
\(X=2\)
\(c.\dfrac{2}{9}:x=\dfrac{2}{3}\)
\(X=\dfrac{2}{9}:\dfrac{2}{3}\)
\(X=\dfrac{1}{3}\)
\(34,\\ a,x=\dfrac{1}{3}:\dfrac{1}{2}=\dfrac{1}{3}\times2=\dfrac{2}{3}\\ b,x=\dfrac{5}{2}\times\dfrac{4}{5}=2\\ c,x=\dfrac{2}{9}:\dfrac{2}{3}=\dfrac{2}{9}\times\dfrac{3}{2}=\dfrac{1}{3}\)
\(35,\\ S_{tấm.kính}=\dfrac{4}{5}\times\dfrac{1}{2}=\dfrac{2}{5}\left(m^2\right)\\ 36,\)
Tổng thể tích nước nho là \(\dfrac{1}{2}+\dfrac{7}{4}=\dfrac{11}{4}\left(l\right)\)
Số cốc nước nho rót đc là \(\dfrac{11}{4}:\dfrac{1}{4}=\dfrac{11}{4}\times4=11\left(cốc\right)\)
