钻研诗词

妈妈今年49岁,她比儿子大26岁.几年前,妈妈的岁数是儿子岁数的3倍? matlab带参数的二元函数求最大值问题syms v x1 x2 g L1 L2S=(v^2*sin(2*x2)+2*v*sin(x2)*sqrt(v^2*(cos(x2))^2+2*g*(L1*sin(x1)+L2*sin(x2))))/(2*g)Sx1=diff(S,x1);Sx2=diff(S,x2);solve(Sx1,'x1')solve(Sx2,'x2')Error using ==> solveUnable to find c What did you like about your last job?翻译下 急a talk about each other's like or dislike about job 求英语对话 已知a是第三象限的角,求 a\2 是第几象限? You,he and I should return on time. --When shall I return the book to you?--____A.sooner,better B.sooner or later C.The sooner,the better D.The soon,the good return i>=j?i: All not to return from head.ChenTing.I shall never forget you 这句话是啥意思?额.朋友叫代问的 外教问 What do you like about china 我该怎么回答? matlab 求二元函数最小值问题.p=d/(tan((pi/4)+2*atan(d/h)-(pi/2)))l=(p/2)*(d*sqrt(p^2+d^2)+p^2*log(sqrt(p^2+d^2)+d))d,h范围为0~10求函数l 的最小值 及最小值点.. "About what colour do you matlab二元函数拟合怎么设计函数.下面是数据,要求拟合一个二元函数,自变量为a,b.请问在非线性拟合之前怎么设计函数,使其拟合误差最小.很急,请大家帮帮忙.a\b6.187.58.710.812.90.350.6070.5303 用MATLAB求一个二元函数极小值的问题,需编写MATLAB程序.用MATLAB求一个二元函数极小值的问题,需求出极小值与对应的坐标点,函数为：z=7.2*sqrt(25+(15-x).^2)+(7.2+(107./(20-x))).*sqrt((8-y).^2+(20-x).^2)+7.2.*yx C语言中,设有“int c=3;int a;a=2+(c+=c++,c+15,++c);”,执行语句后a=? $("p").filter(function(index) { return $("ol",this).length == 0; });jquery中的一段代码$("ol",this)这是什么东西啊?以下是html代码：HelloHow are you? jquery插件中为什么要return return this.each(function() { this.id || (this.id = "ui-id-" + ++n) }); java里的return public class book {private int id;private String name;private String dategory;public String getName(){int id=0;setName("java");return id+this.name;}private void setName(String name){this.name=name;}public book getBook(){return this;} 函数返回一个指针,格式怎么写?(int*this或char*this) return *this return this?return &this? thick ice would you like to go skating?A what B how C What a D How a选哪个？ matlab如何求二元函数最小值 What do you like to do? matlab 求二元函数的最小值问题.我的情况如下：a=x+y^2（这个式子是我随便写的一个）;a是根据前文求出来的,不是事先已知的,因此不像很多网上问的那样,不可能直接用x(1)+x(2)^2这样来代替,用fm matlab二元函数请问各路大神,MatLab中我求二元二次函数,怎么会这样的结果,看不懂啊,>> [xc,yc]=solve('2*(xa-xc)^2+2*(ya-yc)^2=(xb-xa)^2+(yb-ya)^2','2*(xb-xc)^2+2*(yb-yc)^2=(xb-xa)^2+(yb-ya)^2')xc =xc-yb+ycxc+yb-yc-i*((xc+i*(y 二重积分求导 F(t)=∫(上限t 下限1)d(y)∫（上限t 下限y）f(x)dx,求F'(2)=? 已知a为第三象限的角,则2分之a在第几象限? 用带点词语写句子,多么……多么…… 照样子,用带点的词语写句子. 词语搭配什么改造 How do you like .What do you thank about .what do you thank of.What do you like有什么区别与联系How do you like是不是等于What do you thank of上面四个怎么用对不起，应该是think 数学期末总结怎么写 九年级数学期末总结