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  • 1. 算术

    1. (1) two+one=
    2. (2)  one+one= 
    3. (3)  two+three= 
    4. (4)  three+one= 
    5. (5)  Five-one= 
    6. (6)  four-two= 
    7. (7)  three-one= 
    8. (8)  five-three= 
    9. (9)  two+two= 
    10. (10) three-two= 

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