(1/5)*8/(4/5)=(1/5)*8*(5/4)=2
(1/5)×8÷(4/5)=(1/5)×8×(5/4)=2
1/5)×8÷(4/5)=(1/5)×8×(5/4)=(1/5×5/4))×8=1/4×8=2
1/5×8÷4/5=1/5×(8×5/4)=1/5×(2×5)=1/5×5×2=1×2=2