数学题(适于七年级)【不要太简单,不要几何题,类似于应用题类型的难题】20个以上,有没有解都行.我们班以这加分,一个好题20分,做出来一个10分.^_^题好的话,有悬赏的(⊙o⊙)哦.O(∩_∩)O哈

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