口算。
10.1-0.89=
3.4-1.4=
7.82-7.2=
2.19+9.1=
8.1-5.1=
0.68+0.42=
1.57=
0.8+0.18=
0.90.3=
0.728-0.24=
0.89-0.25=
1-0.98=
0.048+0.52=
0.137=
100.05=
5400=
2.010=
19.9+11.1=
3.50.2=
1871000=
50.6=
1+3.89=
0.78=
0.08110=
7510=
0.960.8=
0.87=
1.328=
10.32=
0.21100=
0.74=
0.054=
40.3=
430-250=
0.17+0.06=
1.02-0.09=
7200800=
0.17+0.6=
0.83-0.6=
17300=
0.98-0.09=
0.2+0.78=
600700=
10.2+0.02=
0.15+0.7=