10.489.52 8.2608.26 0.090.9
200001.9万 40.8亿4080000000 32600032万
8角=元 5厘米=米
4.9+1.1= 7.5-5= 6-0.07= 1-0.81=
0.2+2.8= 8.4-4= 1.25+0.5= 5.1-0.8=
0.25+0.4= 0.37+0.3= 90×0.6= 0.4×500=