a,Thể tích của hình hộp chữ nhật là:

3.4.5=60(\(cm^3\))

a, \(x=\dfrac{4}{3}-\dfrac{5}{6} x=\dfrac{4}{3}+\dfrac{-5}{6}x=\dfrac{8}{6}+\dfrac{-5}{6}x=\dfrac{1}{2}\)
b,\(x:16=512x=512.16x=8192\)
c,\(\dfrac{5}{52}-x=\dfrac{1}{4}.\dfrac{13}{4}\dfrac{5}{52}-x=\dfrac{13}{16}x=\dfrac{5}{52}-\dfrac{13}{16}x=\dfrac{5}{52}+\dfrac{-13}{16}x=\dfrac{80}{832}+\dfrac{-676}{832}x=\dfrac{-596}{832}=\dfrac{-149}{208}\)

a,\(\dfrac{5}{9}-\dfrac{1}{9}=\dfrac{5}{9}+\dfrac{-1}{9}=\dfrac{4}{9}\)

b,=\(\dfrac{1}{5}+(\begin{matrix}-3\\2\end{matrix}+\dfrac{-17}{2})=\dfrac{1}{5}+(-7)=0,2+(-7)=-6,8\)
c,\(1+\dfrac{-2}{5}+\dfrac{11}{3}-\dfrac{3}{5}+\dfrac{-2}{13}=1+\dfrac{-2}{5}+\dfrac{11}{13}+\dfrac{-3}{5}+\dfrac{-2}{13}=1+\dfrac{-2}{5}+\dfrac{-3}{5}+\dfrac{11}{3}+\dfrac{-2}{3}=1+\left(-1\right)+3=0+3=3\)