21.52-13.37 30.66+3.4 7.01-0.487
6.2＋2.8= 0.89－0.05=
5.4－4= 0.46＋0.4=
1.2－0.9= 2.6＋1.2=
0.25＋0.75= 1－0.8=
4.3－3.8=
0.5－0.3=
0.16＋0.6=
0.92－0.2=
7.6＋0.4=
1－0.08=
2.5＋5=
3.3＋0.9=
2.45+0.36=
