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小贝利用铝块、细线、量筒和适量的水测量一个形状不规则的小蜡块的密度．如图所示的四个图是小京正确测量过程的示意图，图中V0、V1、V2、V3分别是量筒中面所对应的示数．已知水的密度为ρ水，则下列四个表...
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小京利用铝块细线量筒和适量的水测量一个形状不规则的小蜡块的密度．如图所示的四个图是小京正确测量过程
为了测量某种液体的密度小明取适量这种液体的样品进行了如下实验1将天平量筒放在台面上.将盛有适量液体的
测定形状不规则的小固体密度时质量可用天平测出而体积可用量筒和水配合测出.实验要求量筒里的水应当适量适
某同学使用天平和量筒测量蜡块的密度用调好的天平测量蜡块的质量为m测量蜡块体积的过程如图13所示在量筒
小刚认为浸没在水中的两个物体所受浮力较大的物体会上浮实验桌上有装适量水的大水槽一个大铝块小铝块体积与
利用天平和量筒测量不规则形状石块的密度采用了下列实验步骤其中多余的步骤是
用天平称出石块的质量
用天平称出量筒的质量
在量筒内倒入适量的水，记下量筒内水的体积V
1
在线
用细线系住石块，浸没在盛水量筒内，记下石块和水的体积V
2
现有细线弹簧测力计带提手的小水桶量筒水溢水杯形状不规则的小石块等器材请你选取其中的器材测出完全浸入水
用天平和量筒测量形状不规则小石块的密度下列步骤不需要的是
用天平测量小石块的质量m
1
用天平测量量筒的质量m
2
在量筒内倒入适量的水，记下量筒中水的体积V
1
用细线系住小石块，浸没在量筒的水中，记下量筒中石块和水的总体积V
2
测蜡块密度的方法讨论测蜡块密度关键是想办法测它的体积蜡块的特点是浮在水面上讨论题1如果给你量筒水和一
小文利用托盘天平砝码量筒水细线小铁块测定一个形状不规则的蜡块的密度实验步骤如下 1用调好的天平测
小京利用铝块细线量筒和适量的水测量一个形状不规则的物块的密度他先将适量的水倒入量筒中放在水平桌面上
物块的体积为18cm
3
物块的质量为18g
物块浸没在水中受到的浮力是0.2N
物块的密度为0.9×10
3
kg/m
3
小文利用托盘天平砝码量筒水细线小铁块测定一个形状不规则的蜡块的密度实验步骤如下1用调好的天平测出蜡块
测蜡块密度的方法讨论测蜡块密度关键是想办法测它的体积蜡块的特点是浮在水面上讨论题1如果给你量筒水和一
利用天平和量筒测量不规则形状石块的密度采用了下列实验步骤其中多余的步骤是
用天平称出石块的质量
用天平称出量筒的质量
在量筒内倒入适量的水，记下量筒内水的体积V
1
用细线系住石块，浸没在盛水量筒内，记下石块和水的体积V
2
用天平量筒水小铁块以及一根细线配合测小蜡块的密度写出实验的步骤
小京利用铝块细线量筒和适量的水测量一个形状不规则的小蜡块的密度图18所示的四个图是小京正确测量过程的
小京利用铝块细线量筒适量的水测量一个形状不规则的小蜡块的密度．如图所示的四个图是小京正确测量过程的
用天平和量筒测量形状不规则小石块的密度下列步骤不需要的是
用天平测量小石块的质量m
1
用天平测量量筒的质量m
2
在量筒内倒人适量的水，记下量筒中水的体积V
1
用细线系住小石块，浸没在量筒的水中，记下量筒中石块和水的总体积V
2
小京利用铝块细线量筒和适量的水测量一个形状不规则的小蜡块的密度．图7所示的四个图是小京正确测量过程的
小亮利用细钢针量筒和适量的水测量一个形状不规则的小蜡块的密度．小亮正确的测量过程如图甲乙丙所示图中V
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某种品牌的产品共5件其中有2件次品小王从中任取两件则小王取到都是次品的概率是
顺次连接等腰梯形四边中点得到一个四边形再顺次连接所得四边形四边的中点得到的图形是
如图在▱ABCD中过B点作BM⊥AC于点E交CD于点M过D点作DN⊥AC于点F交AB于点N． 1求证四边形BMDN是平行四边形 2已知AF＝12EM＝5求AN的长．
在直角坐标系中直线y＝x+m与双曲线在第一象限交于点A在第三象限交于点D与x轴交于点CAB⊥x轴垂足为B且S△AOB＝1 1求m的值2求△ABC的面积3求AD的长．
校车安全是近几年社会关注的重大问题安全隐患主要是超速和超载．某中学数学活动小组设计了如下检测公路上行驶的汽车速度的实验先在公路旁边选取一点C再在笔直的车道l上确定点D使CD与l垂直测得CD的长等于30米在l上点D的同侧取点AB使∠CAD＝30°∠CBD＝60°． 1求AB的长精确到0.1米参考数据≈1.732≈1.414 2已知本路段对校车限速为40千米/小时若测得某辆校车从A到B用时3秒这辆校车在AB段是否超速请说明理由．
阅读下面材料小聪遇到这样一个有关角平分线的问题如图1在△ABC中∠A＝2∠BCD平分∠ACBAD＝2.4AC＝3.6求BC得长．小聪思考因为CD平分∠ACB所以可在BC边上取点E使EC＝AC连接DE．这样很容易得到△DEC≌△DAC经过推理能使问题得到解决如图2．请完成1求证△BDE是等腰三角形2求BC的长为多少3参考小聪思考问题的方法解决问题如图3已知△ABC中AB＝AC∠A＝20°BD平分∠ABCBD＝BC＝求AD的长．
一个口袋内装有大小相等的1个白球和已编有不同号码的3个黑球从中摸出2个球． 1共多少种不同的结果 2摸出2个黑球有多少种不同的结果 3摸出2个黑球的概率是多少
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如图▱ABCD的周长为16cmAC与BD相交于点OOE⊥AC交AD于E则△DCE的周长为
已知如图矩形AOBC以O为坐标原点OBOA分别在x轴y轴上点A坐标为03∠OAB＝60°以AB为轴对折后使C点落在D点处求D点坐标．
如图矩形ABCD中CE⊥BD于E若∠DCE＝3∠ECB则∠ACE＝度．
从A地到C地可供选择的方案有走水路走陆路走空中．从A地到B地有2条水路2条陆路从B地到C地有3条陆路可供选择走空中从A地不经B地直接到C地．则从A地到C地可供选择的方案有
如图圆弧形拱桥的跨径AB＝12米拱高CD＝4米则拱桥的半径为米．
如图在△ABC中BC＝5cmBPCP分别是∠ABC和∠ACB的角平分线且PD∥ABPE∥AC则△PDE的周长是cm．
有如下四个结论 ①既是轴对称图形又是中心对称图形的四边形是菱形 ②一个多边形的所有内角中最多只有3个是锐角 ③正五边形的每一个内角都等于108° 其中正确结论的个数为
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假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改.增加:在缺词处加一个漏字符号^并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. LastSundaywhileeatinginarestaurantInoticeabowlfullofdumplingsonthetablenexttomine.Theymusthavebeenleftbysomeone.Justthentheoldmanentered.JudgedfromhisclothesIbelievedshewaspoor.Hesawthedumplingsleftonthetable.Lookingshylyhesatdownandstartedeating.Theothersaroundlookedhimpuzzledbutsomeevenlaughed.Howeverafterfinishingthedumplingshewentuptothedonationboxesonthecounterputonehundredyuaninitandleftthatleftusallshockedandashamed.Weshouldn'tjudgebyapersonjustfromhisorherappearance.
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如图△ABC是等边三角形点DE分别为边BCAC上的点且CD＝AE点F是BE和AD的交点BG⊥AD于G点已知∠BEC＝75°FG＝1则AB的长为
在同一直角坐标系中一次函数y＝kx﹣k与反比例函数y＝k≠0的图象大致是
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已知等腰三角形腰长为2cm面积为1cm2则这个等腰三角形的顶角为．
若sinα＝cos40°则锐角α＝．
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