2又1/2×5/7×3又1/2+(-1/2)÷(-1又2/5)-36×(-4/9+5/6-7/12)=?

问题描述:

2又1/2×5/7×3又1/2+(-1/2)÷(-1又2/5)-36×(-4/9+5/6-7/12)=?

其实,有些题只有自己做了才有收获.不会做2又1/2×5/7×3又1/2+(-1/2)÷(-1又2/5)-36×(-4/9+5/6-7/12) =5/2×5/7×7/2+(-1/2)×(-7/5)-36×(-20/54-7/12) =25/4+7/10+20/3+21 =34.6