0.85*7.5+8.5*0.25和49.5*1.1-49.
问题描述:
0.85*7.5+8.5*0.25和49.5*1.1-49.
答
0.85*7.5+8.5*0.25=0.85*7.5+0.85+2.5=0.85*(7.5+2.5)=8.5 49.5*1.1-49.5=49.5*(1.1-1)=49.5*0.1=4.95
答
0.85*(7.5+2.5) 49.5*0.1