www.5129.net > 微积分题目

微积分题目

解:1。∵dy/dx=(xy²-cosxsinx)/(y(1-x²)) ==>y(1-x²)dy=(xy²-cosxsinx)dx ==>y(1-x²)dy-xy²dx+cosxsinxdx=0 ==>(1-x²)d(y²)-y²d(x²)+sin(2x)dx=0 ==>2(1-x²)d(y²)+2y²d(1-x&#...

解:1。∵dy/dx=(xy2-cosxsinx)/(y(1-x2)) ==>y(1-x2)dy=(xy2-cosxsinx)dx ==>y(1-x2)dy-xy2dx+cosxsinxdx=0 ==>(1-x2)d(y2)-y2d(x2)+sin(2x)dx=0 ==>2(1-x2)d(y2)+2y2d(1-x2)+sin(2x)d(2x)=0 ==>2d(y2(1-x2))+sin(2x)d(2x)=0 ==>2y2(1-x2)-cos(2...

我们已知 (1)f(x) + f(1-1/x) = 2x, 接下来,用1-1/x代替x写入(1)式,可知 (2)f(1-1/x) + f(1/(1-x)) = 2(1-1/x), 然后,用1/(1-x)代替x写入(1)式,我们有 (3)f(1/(1-x)) + f(x) = 2(1/(1-x)), 通过观察,我们知道(1)(2)(3)...

解:1。∵dy/dx=(xy²-cosxsinx)/(y(1-x²)) ==>y(1-x²)dy=(xy²-cosxsinx)dx ==>y(1-x²)dy-xy²dx+cosxsinxdx=0 ==>(1-x²)d(y²)-y²d(x²)+sin(2x)dx=0 ==>2(1-x²)d(y²)+2y²...

解:1。∵dy/dx=(xy²-cosxsinx)/(y(1-x²)) ==>y(1-x²)dy=(xy²-cosxsinx)dx ==>y(1-x²)dy-xy²dx+cosxsinxdx=0 ==>(1-x²)d(y²)-y²d(x²)+sin(2x)dx=0 ==>2(1-x²)d(y²)+2y²...

1.微分在近似计算中的应用: 要在半径r=1cm的铁球表面上镀一层厚度为0.01cm的铜,求所需铜的重量W(铜的密度k=8.9g/cm^3)(说明:cm^3后面的3是幂,也就是立方厘米,下面的r^3也是指r的3次方,依此类推) 解:先求镀层的体积,再乘以密度,便得...

没说就推开门朝着屋内走去,刚走到窗前,他便看到让他喷血的一幕,只见宋雨晴把长裙挽起,露出两条修长的美腿,一根黄瓜在那里直挺挺的立着,同时宋雨晴眼神迷离,嘴里轻声嗯哼着。关注微信公众号“雨秋小说”回复73敬请期待

解: 已知△ABC中,AB=AC,BD⊥AC,且BD=1/2AB 求∠BAC的度数 解:作BD⊥AC,交直线AC于点D (1)当点D在AC上时 ∵BD=1/2AB ∴∠BAC=30° (2)当点D在CA的延长线上时, ∵BD=1/2AB ∴∠BAD=30° ∴∠BAC=150° f'(x)=2x-m/x, h'(x)=2x-1, 取f'(x)=0,得m=2x^2;x=√m/2,...

网站地图

All rights reserved Powered by www.5129.net

copyright ©right 2010-2021。
www.5129.net内容来自网络,如有侵犯请联系客服。zhit325@qq.com