two people start off to walk directly away from each other.they each walk for 4 kilometers then
turn directly to their right and walk for another 3 kilometers.how far apart are they?
人气：330 ℃ 时间：2020-04-04 01:13:57
解答
they are apartfrom each other 10 kilometers
distance=2*v(4*4+3*3）=2*5=10
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