13除以1.5-0.34除以3又3分之1+3分之1除以13分之1-0.34除以1又7分之3
=13÷3/2-0.34÷10/3+1/3÷1/13-0.34÷10/7
=13×2/3-0.34×3/10+1/3×13-0.34×7/10
=13*(2/3+1/3)-0.34*(3/10+7/10)
=13-0.34
=12.66