题目内容
【题目】把下列算式补充完整。
1. six + (____) = nineteen 2. twenty - (____) = four
3. eight + (____) = eleven 4. seventeen - (____) = five
5. four + (____) = fifteen
【答案】1. thirteen 2. sixteen 3. three 4. twelve 5. eleven
【解析】
略
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