24.1×10.1
=24.1×(10+0.1)
=241+2.41
=243.410.02×19.5+19.5+19.5×0.98（简便计算）？0.02×19.5+19.5+19.5×0.98=0.02×19.5+19.5+19.5×(1-0.02)=0.02×19.5+19.5+19.5-19.5×0.02=39或0.02×19.5+19.5+19.5×0.98=（0.02+1+0.98）×19.5=2×19.5=39