> 英语 >
The point P(7,-4)lies on the curve y=4/(6-x)
(a) If Q is the point(x,4/6-x),use your calculator to find the slope
mPQ of the secant line PQ (correct to six decimal places) for the following values of x.
(1) 6.9 mPQ=?
(2) 6.99 mPQ=?
(3) 6.999 mPQ=?
(4) 6.9999 mPQ=?
(5) 7.1 mPQ=?
(6) 7.01 mPQ=?
(7) 7.001 mPQ=?
(8) 7.0001 mPQ=?
(b) Using the results of part (a),guess the value of the slope m of the tangent line to the curve at P(7,-4),m=?
(c) Using the slope from part (b),find an equation of the tangent line to the curve at P(7,-4)
人气:335 ℃ 时间:2020-05-07 23:03:31
解答
a):
题目的意思是求割先PQ的斜率,P点坐标已知,Q点坐标取不同的给定值,P,Q都在双曲线上.
b):由1--8的过程猜测P点的切线斜率;
c):由b,写出P点的斜率公式.
教材中的内容,不难,你自己慢慢算一下.按步骤来.要答案或解答过程,不要翻译啦你英语可能还行, 数学一定是一塌糊涂, 加油啊。我手头连纸和笔以及计算器什么都没有啊,要不怎么让别人算啊别急。 最恨别人说你不行, 是吧? 过程方法思路最重要,结果在这里倒是其次。我是真没辙了,就一台电脑在跟前,我这些题还全得在网上做,没演算纸没笔没计算器我怎么算!

aYpXpYq=4/(6-Xq)Xqm=(Yp-Yq)/(Xp-Xq)
1-47-4.4444444446.94.444444
2-47-4.040404046.994.040404
3-47-4.0040040046.9994.004004
4-47-4.000400046.99994.000400
5-47-3.6363636367.13.636364
6-47-3.960396047.013.960396
7-47-3.9960039967.0013.996004
8-47-3.999600047.00013.999600
b)m=4

 

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