5.5x101+45x9.9怎么简便
5.5x101+45x9.9怎么简便 -
5.5x101+45x9.9 =5.5×(100+1)+45×(10-0.1)=550+5.5+450-4.5 =1000+1 =1001
5.5x101+45x9.9 =5.5×(100+1)+45×(10-0.1)=550+5.5+450-4.5 =1000+1 =1001