hard math is good(revision mode )

hard math is good(revision mode )

​revision 时间的加减混合运算

​choose time

Multiple Choice

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8分钟22秒减4分钟33秒加11秒等于多少秒

• 4分钟

• 240秒

• O(∩_∩)O

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choose 1or2or3or4

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​THE END