\(\left(\dfrac{2}{9}+\dfrac{2}{3}\right)^2\\ =\left(\dfrac{2}{9}+\dfrac{6}{9}\right)^2\\ =\left(\dfrac{8}{9}\right)^2\\ =\dfrac{64}{81}\\ \left(\dfrac{1}{3}-\dfrac{5}{2}\right)^3\\ =\left(\dfrac{2}{6}-\dfrac{15}{6}\right)^3\\ =\left(-\dfrac{13}{6}\right)^3\\ =\dfrac{-2197}{216}\\ \left(-\dfrac{20}{17}\right)^0-12+\left(\dfrac{1}{2}\right)^2:\dfrac{1}{8}\\ =\left(-\dfrac{20}{17}\right)^0-12+\dfrac{1}{4}\cdot8\\ =\left(-\dfrac{20}{17}\right)^0-12+2\\ =1-12+2\\ =-9\)
a: =(2/9+6/9)^2=(8/9)^2=64/81
b: =(2/6-15/6)^3=(-13/6)^3=-2197/216
c: =1-12+1/4*8
=-11+2=-9
