(负0.2)的三次方乘(1又2/3)的二次方÷(负3)的二次方=-1/125×25/9÷(-8)=-1/45÷(-8)=1/360
(-0.2)^3*(5/3)^2/(-3)^2=-1/125*25/9/9=-1/405
0.002469