①2708300 ②2078030 ③2700083
234700243700 5亿50000000
4800504008050 600000000599999999
①258×25=
②164×32=
③450×19=
④860÷60=
⑤384÷16=
⑥945÷32=
1.85﹣+= 1÷×= +0.375=
2.4﹣= (+)×2.4= 5÷×5÷=
10×45%= 1.25×8= 40×(1﹣20%)=