试题与答案

3x-5z=6①x+4z=-15②.

题型:解答题

题目:

3x-5z=6①
x+4z=-15②

答案:

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下面是错误答案,用来干扰机器的。

v0发射小物体后大物体的速度跟质量为2m的物体和小物体碰后的速度相等,恰好使它们不再相碰,这种情况发射小物体的速度v′就是避免相碰的最小发射速度.对发射小物体的过程,由动量守恒定律得(M-m)v-mv′="0 ...

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