13 + 5 - 18, 12 + 8 - 20, 15 + 4 - 19, 12 + 9 - 21, 14 + 3 - 17, 17 + 5 - 22, 18 + 8 - 26, 16 + 7 - 23, 11 + 5 - 16, 12 + 2 - 14,

Mental Calculation

排行榜

视觉风格

选项

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