题目内容
口算. 53+35= |
87-35= | 70+50= |
46+23= | 74-28= | 70-42= |
53+35=88, | 87-35=52, | 70+50=120, |
46+23=69, | 74-28=46, | 70-42=28. |
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题目内容
口算. 53+35= |
87-35= | 70+50= |
46+23= | 74-28= | 70-42= |
53+35=88, | 87-35=52, | 70+50=120, |
46+23=69, | 74-28=46, | 70-42=28. |