题目内容
口算:
| 420÷60= | 1-0.1= | 99×9.9×0= | 1.09+0.91= | 4.35×10= |
| 30×80= | 4.2÷21= | 2.5×1.9×4= | 88+104+96= | 67÷10= |
| 420÷60=7, | 1-0.1=0.9, | 99×9.9×0=0, | 1.09+0.91=2, | 4.35×10=43.5, |
| 30×80=2400, | 4.2÷21=0.2, | 2.5×1.9×4=19, | 88+104+96=288, | 67÷10=6.7. |
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