简算:29*27/30

问题描述:

简算:29*27/30

29*27/30
=29*9*3/(3*10)
=29*9/10
=261/10
=26.1

26.1

30*27=810 810-27=783 783/30=261

(30-1)*27/30
=27-27/30
=27-9/10
=26.1

29*27/30
=(30-1)*27/30
=30*27/30-27/30
=27-9/10
=26又1/10