都是对的,用个简单的方法说明下第一个,其实只要是匀加这个说法就成立,因为匀加中有这样一个公式：中间时刻速度=平均速度,那么第4秒内的平均速度应该等于第3.5秒末的速度,而前4秒内的平均速度等于第2秒末的速度,因为...
最好有详细的思路,Thank you very much!
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