Correct: 10 - 5 =, 10 - 3 =, 5 - 3 =, 8 - 2 =, 10 - 0 =, Incorrect: 4 - 2 =, 4 - 0 =, 9 - 1 =, 10 - 4 =, 5 - 2 =,

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恢復自動保存: ?