0.65*1.01=0.65×（1+0.01）=0.65+0.65×0.01=0.65+0.0065=0.6565
5.2*0.9+0.9 =（1-0.1）×（5.2+1）=6.2×1-0.1×6.2=6.2-0.62=5.58
（25+2.5+0.25）*4=25×4+2.5×4+0.25×4=100+10+1=111
4.4×25=（4+0.4）×25=4×25+0.4×25=100+10=110