1、5.790.991.010.86862.8+152.819.80.5-9.828.575-3.5755.46101-5.462.83.50.414.70.358.60.45+4.50.140.550.6+0.117四、聪明的你，答一答。（共35分）1.双十一快到了，网上各店都打折销售，乐乐网购了菠萝和火龙果各3.5千克，乐乐一共花了多少钱？(6分)8.2元/千克12.8元/千克2.2019年军运会在湖北武汉举行，盈盈兄妹两和父母5车去看开幕式，往返的交通费要多少元？(7分)2/7=5.79(1-0.01)=5.791-5.790.01=5.79-0.0579=5.73211.010.86=(1
2、+0.01)0.86=10.86+0.010.86=0.86+0.0086=0.8686862.8+152.8=(86+15)2.8=1012.8=(100+1)2.8=1002.8+12.8=280+2.8=282.819.80.5-9.82=19.82-9.82=(19.8-9.8)2=102=208.575-3.5755/7=(8.57-3.57)5=5:5=15.46101-5.46=5.46(101-1)=5.46100=5462.83.50.4=2.8(3.50.4)=2.81.4=214.70.35=147035=428.60.45+4.50.14=8.60.45+0.451.4=(8.6+1.4)0.45=100.45=4.50.550.6+0.117=0.11(50.6)+0.117=0.113+0.117=0.11(3+7)6/7
