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prepare a statement of the variances,state five possible causes of an adverse labor rate varianceexplain the possible reason for inter-relationship between materials variance and labour variance 圆的面积怎么算不要公式,要举例子怎么算,如:6厘米直径的园的一半怎么算圆周率取几位,给算式 有大、小两个圆,大圆直径比小圆直径多28%,那么小圆的面积比大圆的面积少百分之几?(保留一位小数) (1)要使下列方程5x+3y=4m,4x-5y=8m-3,6x-2y=9m同时成立,求常数m的值(需要过程答案)(2)解方程组x/3=y/4=z/5 ,x-2y+3z=30(需要过程答案) 224 14如图,ABED与三角形DEC的面积比为6:7,BE和EC得长度分别是多少厘米?http://hi.baidu.com/%C1%F5%CA%AB%CA%ABs/album/item/3a7e191b50a78a834bedbce4.html在这里 wo de zhu ce biao bei gai le ,dao chu dou shi luan ma ,wo gai zen me ban a wo sm dou bu zhi dao wo ba ke le dou jie le ni zi dao 翻译成中文die er :wo zhi dao ,wo fa de xin xi ni dou kan jian le wo mei ci dou zhao bu dao lv pen you zen me ban 若函数y=根号下(kx平方-6x+k+8)的定义域为[-7,1],求实数k的值 小学六年级数学题6—13题 科技城太阳能汽车电池研究所最近开发了一种新型汽车电池,它的太阳能接收板面积为8m^2,正对太阳时能产生120V的电压,并对汽车电动机提供10A的电流,已知汽车电动机的直流电阻为4欧姆,而太 初三有物理竞赛吗 k= 时,多项式x平方-kxy-3y平方-1/3xy-7中不含xy项 japan is the_ of a country. The head office of the bank is in Beijing,but it has all over the country.A.companies B.branches C.organizations D.background the _______(mean) of "nation" is "country" 28.I think the headmaster is a rigid man who lacks of a ____ of humour.A、 air B、 touch C、 gas D、 sense 当k=____时,x²-kxy与y²+3xy-5的和不含xy项十分钟内速求好评 当k=什么时,x2-kxy与y2 3xy-5的和中不含xy项 I'm going to visit my aunt this Sunday.Do you want me to __ any messagesA.pass onB.pass byC.leaveD.carry 帮忙写篇英语作文.题目you are going to visit your Aunt Monica in the countryside.在信中要有以下几点1.thank her for her invitation 2.tell her when you are going to arrive 3.describe what you hope to do there 英语选择when are you going to leave?The train ____ at 6:00 a.m.a.left b.leave c.leaves 英语选择题---are you going to be after graduation?I want to go to -----sea..A.What,/ B.Who,/---are you going to be after graduation?I want to go to -----sea..A.What,/ B.Who,/ C.How,the D.What,the 恰有两个小孩的家庭,已知这家有一个女孩,求这家另一个孩子是男孩的概率?那这个问题的答案到底是什么? 有三个孩子的家庭 已知有一个女孩 在这种情况下求至少有一个男孩的概率 一个圆柱体的底面半径为 r 侧面展开图形是一个正方形圆柱的高是() I am going there ____ my car A.by B.in C.to D.on 怎么选How are you going to the shop meet your aunt?I am going there _my car .A by B in C on为什么不用on.on和in的区别是什么 going there ( )my car 中介词填什么?by in 还是 on 初三物理竞赛题有一辆26英寸自行车(26英寸为车轮直径,1英寸等于2.54厘米),其大牙盘有40个齿,后轮轴上的飞轮有16个齿.链条连着大牙盘和飞轮,如果车轮与地面不打滑,骑车人双脚踏车的周期是1