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  • 1. (2020三上·期末) 算一算,选择正确的选项补全算式。

    A. ten    B. four   C. three   D. five   E. six   F. seven

    1. (1) one +=six
    2. (2) two+ one=
    3. (3) +three = ten
    4. (4) nine- =five
    5. (5) seven+ three =
    6. (6) three+=nine

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