25.8-4.5= 3.1+3.9= 7.5+41.5= 6.12-6.1= 64.7+0.5= 31-0.8= 22.8+4.9= 7.6+1.9= 2.5-0.05= 3.6-0.09= 3.9+8.1= 9.8+1.6= 11-0.67= 3.3+7.68= 6.5+6.05= 5.9+3.1= 6.1+3.8= 5.4-4.6= 2.13+2.7= 4.9+2.6=
15-1.6= 1.02+2.8= 5.3-3.5= 4.4+1.6= 6.06+3.4= 35.4+7.6= 7.7-0.8= 18-0.9= 3.3+3.06= 5.4+2.66= 5.86-0.8= 10-0.25= 5.5+5.75= 6.1+1.9= 0.7+30.5= 2.5-1.3= 15.4-0.6= 4.3+5.6= 1.8+5.57=
10.6-0.3=
6.3+4.56= 25.4-3.5= 19.8+3.3= 6-0.35= 7.3-0.7= 2.5+5.63= 13.4+6.5= 18-0.8= 2.4-2.02= 1.6+21.34=
四年级口算（十五）
3.3+4.5= 2.5+0.75= 5.4-0.3= 9.2+0.08= 12.5-6.5= 7.1+42.9= 5.6+5.5= 3.2-3.01= 6.45+2.5= 2.9+1.2=
四年级口算（十六）
5.3+23.7= 10.2-0.5= 1.4+6.06= 47.9-10.9= 2.3+8.77= 11.2-2.4= 38-16.5= 9.9+12.1= 29.8+10.2=
17.8-2.9=
2.3+0.07= 6.04+3.96= 7.2-6.8= 10-3.5= 3.4-2.9= 13.6-8.6= 27.6-6.6= 8-0.4= 7.7-3.9= 5.8+3.2=
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