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口算:18÷9×5= 4.8+10.2= 6-2.5= 9.6-3.6= 17.9-4.5= 7.3+2.61= 50×3= 20÷4÷7= 13+3×9
口算:18÷9×5=4.8+10.2=6-2.5=9.6-3.6=17.9-4.5=7.3+2.61=50×3=20÷4÷7=13+3×9=31-6+4=33+17-32...
口算:18÷9×5= 4.8+10.2= 6-2.5= 9.6-3.6= 17.9-4.5= 7.3+2.61= 50×3= 20÷4÷7= 13+3×9= 31-6+4= 33+17-32= 30-42÷7=
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解:18÷9×5=10, | 4.8+10.2=15, | 6-2.5=3.5, | 9.6-3.6=6, | ||
17.9-4.5=13.4, | 7.3+2.61=9.91, | 50×3=150, | 20÷4÷7=
| ||
13+3×9=40, | 31-6+4=29, | 33+17-32=18, | 30-42÷7=24. |
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