一、口算。
1.20.2=
2.54=
0.25+4=
1.870=
3.5+0.5=
1.20.4=
3.64=
01.25=
0.126=
0.640.03=
5.8+4.2－6.5=
7.83=
0.1258=
2.81.4=
0.250.5=
7.217=
0.3510=
3.63=
6.30.9=
0.546=
0.30.1=
1.32=
0.48=
27.33=
0.510.3=
150.01=
510=
0.712=
0.20.5=
3.80.1=
0.20.2=
0.040.4=
12.4+7.6=
80.5=
0.7236=
92.5+2.5=
1.83=
2.32=
6.55=
2.142=
2.54=
2.72=
0.57=
4.8+3.6+5.2=
3.41.7=
2.5+0.2=
4.55=
5+2.8=
0.80.3=
13.520=
5.255=
42.2=
0.120.5=
1.85=
6.242=
2.83－1.43=
1.2+2.9=
3.82=
1.323=
4.67=