0.8-0.3= 6.25-3.2= 18-0.58= 13.8+1.9= 41.5-3.8= 3.56+6.4= 41.5+3.7= 4.7-2.65= 43.19+5.1= 52.7+7.53=
1.23+0.77= 4.3-3.4= 1.39+8.7= 1.81+3.3= 8.9+2.1= 3.6-24.8= 1.72+6.7= 12-1.2= 9.5+0.9= 5.9-2.2=
25.3+6.6= 16-0.53= 37.5+4.61= 7.58+0.3= 12.5-2.7= 10-7.6= 22.9-2.8= 1.18+20.9= 56.8-3.9= 35-4.5= 2.5+9.45= 6.35-1.5= 53.6-15.4= 8.08+2.02= 4.19-2.1= 2.27-0.5= 3.12+5.19= 37.15+2.85= 5.41+42.6=
45.2-15.2=
14.41+2.09= 26.1-19.4= 6.45+25.3= 14.29+5.11= 37.15-45.02= 12.5+5.64= 23.05-16.02= 5.93-3.6= 11.3+23.65= 9.17-5.06=
四年级口算（十七）
45.1-25.1= 9.58+4.3= 26.1+4.59= 4.6+18.67= 4.85+2.5= 3.3+9.8= 34.5-21.6= 8.66-2.46= 28.5-3.8= 25.6+14.4=
四年级口算（十八）
75.6-26.4= 3.07+20.5= 20.3-17.1= 24.3-12.24= 28.25+3.15= 31.26-12.5= 4.66+12.4= 16.72+0.6= 30.1-10.05=
23.9+7.88= 25.4-6.2= 7.51+3.8= 8.46-5.41= 42.1-6.1= 6.55-4.24= 5.09-3.4= 24.1+12.34= 3.94+6.2= 8.38+34.12= 12.6-2.5=
