把27拆成26+1
这样原式等于(26+1)*3/26
=26*3/26 +3/26
=3+3/26
=3又26分之3
27x3/26
=(26+1)x3/26
=26x3/26+3/26
=3+3/26
=3又3/26
原式
=(26+1)*3/26
=26*3/26+1*3/26
=3+3/26
=3又3/26
等于81/26
27×(3/26)=(26+1)×(3/26)=26×(3/26)+1×(3/26)=3+×3/26=3右3/26
=(26+1)×3/26
=26×3/26+1×3/26
=3+3/26
=3又3/26