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- 35除以数,平均数30,把其中一个改为60,平均数为40,改动数原来是几?
- 4大一高数:无穷小比较
- 5不等式组-2≤5分之2(1-3)x<7
- 6为什么有弹力不一定有摩擦力?
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- 8一元一次方程的概念:_.
- 9Come upstairs to finish your homework.为什么要改Come upstairs and finish your homework.
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