17×2分之3+1.5×14-1又2分之1÷5分之1
=17×1.5+1.5×14-1.5×5
=(17+14-5)×1.5
=26×1.5
=392.5×（5分之2-3分之1）+2又4分之1÷0.5采纳我，重新问