题目内容
口算.
| 37+73= | 20×50= | 123÷3= | 4×50= | 80-28= | 60×13= | ||||||||||
| 6+0.4= | 6-0.4= | 3.5+2.8= |
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| 37+73=110, | 20×50=1000, | 123÷3=41, | 4×50=200, | 80-28=52, | 60×13=780, | ||||||||||||||
| 6+0.4=6.4, | 6-0.4=5.6, | 3.5+2.8=6.3, |
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