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加工已批零件,甲单独做要15小时完成,乙单独做要每小时能加工96个零件.当他们共同完成任务时,甲加工的个数占总数的62.5%.乙加工了多少个零件? 1.我们探究三角形面积的时候,两个完全相同的三角形可以拼成一个（ ）,这个（ ）底等于等于三角形的（ ）,它的高等于三角形的（ ）,每个三角形的面积等于（ ）面积的（ ）.因为（ ）的 一动圆与已知圆O1:(X+3)^2+Y^2=1外切,圆O2：（X-3)^2+Y^2=81内切,则动圆圆心的轨迹方程为? 1、某工程对承担了修建长30米地下通道的任务,由于工作需要,实际施工时每周必原计划多修1米,结果提前1周完成,求该工程队原计划每周修建多少米?2、十一黄金周,几名同学包租一辆面包车去 某人到保险公司办理房屋火灾保险,其保险金为其房屋价值的三分之二,按规定每元保险金一年应交付保险费1分5厘,已知该人一年应缴付保险费2020元,其房屋价值是多少? 1：填空题（1）一项工程,甲单独做10天完成,乙独做15天完成.*1：甲.乙两队合作,每天完成这项工程的几分之几?（）*2：甲.乙合作（）天可以完成这项工程.*3：甲.乙合作4天后,还剩下全工程的 请帮忙解一下下面这道数学题（关于黄金分割的）谢谢--已知线段AB长为跟号10,C分AB为两部分,其中AC=（五倍的跟号2-根号10）/2,BC=（三倍的根号10-五倍的根号2）/2求证：C是线段AB的黄金分割点 ln(x-5)+ln(x+3)-2ln2=ln(2x-9)求未知数 谁能帮我算出这道数学题费奥多·瓦西列耶夫是一位来自俄罗斯舒亚的农民,令他骄傲的是,他的妻子瓦莲京娜生了69个孩子,破了吉尼斯世界纪录.她生了16对双胞胎,7个三胞胎和4个四胞胎,27个单 山东暑假生活指导的几道数学题第28页第7题：已知某铁路桥长800m,现有一列火车从桥上通过,测得火车从开始上桥到完全过桥共用45s,整列火车完全在桥上的时间是35s,求火车的速度和长度和“ 1.在△ABC中,若∠A=2、∠B=3∠C,则∠B= ,∠C= .2.已知一个三角形的两边长是2.5cm、4.5cm,且周长为偶数,则第三边长为 .3.若一个n边形的每个内角都是150°,则n= . A服装厂购入一批裤条边为14187米,预计要做6000件.每100米可做41件.问这14187米做6000件还差多少米? 求数学题的巧算方式,谢谢 一堆钢管的计算方法一堆钢管,每相邻两层都相差一根,最上层有2根,最下层有8根,这堆钢管共（ ）根. 英语翻译Given a set of 148 points in a square with side length one,show that there is always a set of four of these points which lie interior to a circular disc of radius 1/9 英文翻译: 英语翻译翻译 急… 那时他在努力算出这道数学题.翻译英语 分解因式x(x-y)(a-b)-y(y-x)(b-a)化简计算：已知2x-y=0.5,xy=2,求2x^4y^3-x^3y^4的值 1. 2.观察数字摆放规律,求a,b,c的值 3. 1.在四边形ABCD中,∠A的∠B,AC=BD,求证AB‖CD 注:此四边形为梯形2.已知,在四边形ABCD中,AC平分∠BAD,∠CBE=∠D,求证∠B=∠D.3.在四边形ABCD中,∠ADC=∠ABC=90°,AD=CD,DP⊥AB,若AB=10,AP=2,求BC的长!第一题要详细 一道sat数学题a measuring cup contains 1/5 of a cup of orange juice .it is then filled to the 1 cup mark with a mixture that contains equal amounts of orange,grapefruit,and pinapple juices.what fraction of the final mixture is orange juice 答案 1.Point A has coordinates (-2,1),point B has coordinates (3,3).If line segment AN is rotated 90° clockwise about point B,what are the coordinates of the image of point answer(1,8)2.What is the maximum number of peices that can be cut from a paper ci if k is positive one digit integer ,which of the following is not a possive value of 1-k?A -9 b -5c -2D -1E 0 if 55 percent of a group of people have brown hair and 80 percent of the same group do not have red hair,what fraction of those who do not have brown hair have red hair?A.四分之一B.十一分之四C.九分之四D.九分之五E.五分之四 In the integer 3589 the digits are all different and increase from left to right.How many integers between 4000 and 5000 have digits that are all different and that increase from left to right?这是一道填空题,不理解题目意思,求地道翻 If a (n) = a(n-1) / a(n-1)-1,a (1)=8,which of the following is a (501)?A 8 B 7/8 C 1/8 D 8/7 E 4 SAT数学题求讲解Note:Figure not drawn to scaleIn the figure above,if the legs of triangle ABC are parallel to the axes,which of the following could be the lengths of the sides of triangle ABC?A 2 ,5 and 根号29B 2 ,5 and 7C 3 ,3 and 3根号2D 3 SAT数学题求解释In the xy-coordinate plane, the graph of x = y*y -4 intersects line l at (0, p) and (5, t). What is the greatest possible value of the slope of l?（求大神救救我TAT,这题是肿么回事.） 一道sat数学题求解释如果（X+Y ）^2 = X^2+Y^2 那么下面结论那个是正确的.1.x=02.（x-y）^2=x^2+Y^23 XY=02和3 但是我觉得1也对啊.但不是一直对.和没解释一样 . .SAT的数学题In the 30-day month of April,for every three days it rained ,there were two days it did not rain.The number if days in April on which ie rained was how much great than the number of days on which it did not rain? sat数学题The sum of four consecutive odd integers w,x,y,and z is 24.What is the median of the set{ w,x,y,z,24}?