题目内容
完成下列算式。
1. three + nine = ____________
2. ____________ + ten = sixteen
3. twenty - ____________ = eighteen
4. four + thirteen = ____________
5. eight + ____________ = nineteen
6. ten + seven = ____________
2. ____________ + ten = sixteen
3. twenty - ____________ = eighteen
4. four + thirteen = ____________
5. eight + ____________ = nineteen
6. ten + seven = ____________
1. twelve 2. six 3. two 4. seventeen 5. eleven 6. seventeen
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