简算:29*27/30
问题描述:
简算:29*27/30
答
29*27/30
=29*9*3/(3*10)
=29*9/10
=261/10
=26.1
答
26.1
答
30*27=810 810-27=783 783/30=261
答
(30-1)*27/30
=27-27/30
=27-9/10
=26.1
答
29*27/30
=(30-1)*27/30
=30*27/30-27/30
=27-9/10
=26又1/10