Question

一道数学题 ，求解答

Productivity and yield of cultivated crops are often reduced by insect pests. The following graph shows the relationship between the yield of a certain crop, f(x), as a function of the density of aphids x. (Aphids are small insects that suck plant juices.) Here,f(x) is measured in kilograms per 4000 square meters, and x is measured in hundreds of aphids per bean stem. By computing the slopes of the respective tangent lines, estimate the rate of change of the crop yield with respect to the density of aphids when that density is 200 aphids/bean stem and when it is 800 aphids/bean stem.

200 aphids/bean stem_____kg per 4000 m2 per aphid per bean stem
800 aphids/bean stem_____kg per 4000 m2 per aphid per bean stem

Answer 1

种植作物的生产力和收益率往往减少了害虫。下面的图显示了某种作物的产量之间的关系,f(x),作为蚜虫密度的函数x。(蚜虫是小昆虫,吸食植物汁液。)这里,f(x)是每4000平方米,以公斤和x以数以百计的蚜虫/豆茎。通过计算各自的切线的斜坡,估算作物产量的变化速度对蚜虫的密度,密度是200蚜虫/ bean时阀杆和800蚜虫/豆茎。

200蚜虫/豆stem_____kg每4000平方米蚜虫/豆茎
800蚜虫/豆stem_____kg每4000平方米蚜虫/豆茎

我只能帮到这了

Answer 2

还是英文的！！！！！！！！！！！！！！！这么变态！！！！太坑了

Answer 3

estimate是估计的意思 这题应该没标准答案吧 用双曲线导数算不出来
填空应该是x=200和800时 对应y的值 看图的话 第一个填850 第二个填300