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星星出题李大伯上山采药,上山时他每分钟走50米,18分钟到达山顶,下山时,他沿原路返回,每分钟走75米,求李大伯上下山的平均速度。伙伴帮忙咔吱兔自告奋勇地说:“哎呀,这个简单,求平均速度嘛,就用(50+75)÷2=62.5(米)。”朵朵猪连忙补充道:“不对,你这求的是速度的平均数,而不是平均速度。一般说来,求平均速度需要有两个最基本的条件:一是
When he climbed the mountain, he walked 50 meters per minute and reached the summit in 18 minutes. When he went down the mountain, he returned along the same route and walked 75 meters per minute to find the average speed of Li Da-bo going up and down the mountain. The companion helped him and said, ”Oh, this simple, average speed is (50 + 75) ÷ 2 = 62.5 (m).“ Blossoming pig quickly added: ”No, you This is the average speed, rather than the average speed.In general, the average speed requires two basic conditions: First,