4/5×2/3+1/5÷3/2=4/5×2/3+1/5×2/3=2/3×(4/5+1/5)=2/3 ×1=2/3
原式=4/5×2/3 1/5×2/3=(4/5 1/5)×2/3=2/3;
4/5×2/3+1/5÷3/2=4/5×2/3+1/5×2/3=(4/5+1/5)×2/3=1×2/3=2/3