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用"is","am","are"造过去式.例:I am ill today--I was ill yesterday--Were you ill yesterday.要造5句 数学题 努力计算!1、已知x的平方+y的平方=25,x+y=7,且x>y求x-y2、若x的平方+ax=（x+1/2)的平方+b求a、b的值3、已知a+b+c=0a的平方+b的平方+c的平方=1求:ab+bc+ac快答,在线等!好着奖励! 怎样做数学题才算尽到自己最大努力了? 请一定要认真的算 千万不要错了3X的平方＋2X的平方－7X＋4X－3化简就行了是5X的平方＋3X－3还是5X的平方－3X－3 根据函数单调性定义,判断y=ax^2+1(a不等于0)在[0,正无穷大)上的单调性并给出证明 a.were you at school yesterday b.ha.were you at school yesterday b.heiio,ben c.what are doing now You were at school yesterday 否定句 一般疑问句 否定回答 where were you yesterday morning?这句话的意思是.o(∩_∩)o...哈哈 Were they at school yesterday?肯定与否定回答 Teacher:You were _____for school yesterday.Peter:YES,MISS PENG .MY ______ was late.Teacher:Where were you yesterday?Peter:I was ____.Miss Peng.I was in ___at home.Teacher:I don't ____believe you ,Peter.You _____telling a lie .YOUR bus wasn't____.Pete 利用单调性定义,证明函数y=x+2/x+1在(-1,+无穷)上是减函数 Tom was a worker 对划线部分提问 I got to school at six yesterday afternoon对划线部分提问划线部分是a worker 划线部分是at six I was reading a novel at three yesterday afternoon,对划线部分提问 （ 划线部分 a novel） I was late for school yesterday afternoon because I watched TV.(对划线部分提问) __________________ I was reading a novel at three yesterday afternoon（划线a novel提问） 梯形高1/4千米 上底1/4千米 如图是一个梯形,如果下底是高的2倍,那么给这个梯形稻田灌溉,灌溉的面积是 计算圆周率的算法算法公式是 PI=4*(1-1/3+1/5-1/7+1/9-.)请看下面这个程序#include #include main() {float n,pi,t; int k=1;pi=0,t=1,n=1; while(fabs(t)>1e-6) {t=k/(2*n-1);pi=pi+t; k=-k; n++; } pi=4*pi; printf("%f",pi); } 为什么要把 圆周率PI怎么算出来的? 函数y=3x/√￣1-2x+(2x+1)的定义域为? y=3x2十2x-1求函数的定义域 若函数y=f(1-x)定义域为【1,3),则y=f(2x-1)的定义域是：—————— they were (at the movie theatre)yesterday afternoon.对画括号部分提问. They were at home yesterday evening.（划线提问）at home是划线的 23.----Were they away yesterday?----_____________________.A． Yes,they're B． Yes,they wereC． No,they were D．No,their weren't Did they have the history at school yesterday?No,they went to visit the History Museum.初中的改错题,求大虾帮助,知识点是冠词 圆周率的算法如题 They were ___________(welcome) by the history. 圆周率算法π=(1-1/3+1/5-1/7+…1/4n-3-1/4n-1)*4 π=2*1+1/3+1/3*2/5+1/3*2/5*3/7+1/3*2/5*3/7*4/9+.请给我讲下这个算法啊就是让我明白它实际怎么计算的啊举例说明一下 matlab (1)选取10000对随机的a,b,根据(a,b)=1的概率求出圆周率的近似值 (2)用Monte Carlo方法计算圆周率不要拿不能用的代码糊弄我...发到594783107@.com 能不能创作一个无理数 除了圆周率和含有根号的无理数. (x的五次方+3x³)÷x³-(x+1)²,其中x=-0.5 人们发现的第一个无理数是什么 是根号二还是圆周率?一定要说明理由，