农田水力学计算题

怎样快速记乘法口决 中美关系是什么 青蛙是否是益虫青蛙属于益虫一类吗? 一个数同时有15和24两个因数,这个数最小是多少?最好写出怎么解 已知在△ABC中a=(2√3+1),B=45度C=30度求边长c和面积S mathematica 解方程Solve[cos (6^(1/2)/3*(t + t3/2))*sin (6^(1/2)/3*t3/2) - cos (6^(1/2)/3*(t + t2 + t3 + t1/2))*sin (6^(1/2)/3*t1/2) == 0,t]我这样写对吗？但用/.带进去算输出不是零是什么问题？ 已知i 二次函数f(x)的最小值为1,且f(0)=f(2)=3.问若f(x)在区间[2a,a+1]上单调,求a的取值范围 请讲解18．液化石油气作为燃料,已普遍进入城市家庭,它是含有下列物质的混合物,在常压下,这些物质的沸点如下表所示：物质名称乙烷丙烷丁烷戊烷己烷沸点/℃-88.6-42.2-0.536.169.2在常温下使 答案选择D,为什么?要详解哦有以下程序#include main() {int i,j;for(i=3;i>=1;i--) { for(j=1;j 为什么选D求详解 证明lim （sin√n-sin√n+1）＝0 在△ABC中,a=2,∠A=30°,∠C=45°,则△ABC面积为? 在△ABC中,已知∠A=45°,角C=30°,c=10,求b和△ABC的面积 已知对于任何实数x,二次函数f(x)=x2-4ax+2a+12(a∈R)的值都是非负的,求函数g(a)=(a+1）（|a-1|+2）的值域? 设二次函数f(x)=x2-(2a+1)x+3,若函数f(x)的单调增区间为[2,+∞],则实数a的值为能不能再说一下这类题目一般用什么方法解 把6名同学分到三个班…不同分法有多少种?每个班分两人！都是高才生！A.24…B.60…C.90…D.108 排列/组合 4个同学分到3个班级,每班至少1人,则分配分法有几种?求步骤………4个同学分到3个班级,每班至少1人,则分配分法有几种?求步骤………… lim(n→∞){2^n[sin(x/2^n)]}求详细过程,谢谢! 箱子中有3个红球,2个白球,任意取2个,全为白球的概率 中国古代的楼兰古国是何时消失的? 中国古代有多少个古国 中国四大古文明古国是; ssat的数学难吗 ssat数学难吗 SSAT数学a box was made in the form of a cube,if a second cubical box has inside imensions thress times those of the first box,how many time as much does it contain? 第一道：if the length of one of the legs of a right triangle is decreased by 10%,and the length of the other leg is increase by 20%,then what is the approximate percent change in the area of the triangle?第二道：if m is a positive integer,and 英语翻译Buddy you're a boy make a big noisePlayin' in the street gonna be a big man some dayYou got mud on yo' faceYou big disgraceKickin'your can all over the placeSingin'We will we will rock youSing itWe will we will rock youBuddy you're a youn 英语翻译1.Summary of the billIn this bill,the following measures are to be mainly taken:1) Top Runner Program* for Building Materials,etc.The Top Runner Program has so far been applied to machinery and equipment that consume energy.This amendment 有的对联最后一个字是第二声和第一声那怎么看上联和下联 门 下 又 大 十 斤加个部首组成什么字加个字 组成共同的部首 有甲,乙,丙,丁四个同学分到三个班,每个班至少一人,且甲乙不能分同一个班级.请问有几种分法?