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【题目】如图1,矩形 ABCD(ADAB) ,点E在边AD上,点F在射线DC上,连接BE、BF,且2∠AEB=∠ABF.ADAEAEDFBCBBC图1F图2F图31)求证:∠BFD=2∠ABE2)如图2,当AE=DE时,求证:2AB-CF=BF;3)如图3,当BE=BF,DF=10, BF:AB=3 2时求线段DE的长
初始#BBCFBC 暗度#8C9B8D 对比色#FF00E8 去饱和#C0CFC1 网页安全色#CCCCCC RGB R G B CMYK C M Y K HSL H S L HSV H S V XYZ X Y Z RGB颜色查询简介 字客网RGB颜色查询在线工具是一款功能强大的RGB颜色查询工具,包括对应CMYK、RGB、HSL、HSV、XYZ等色彩空间的色值,颜色梯度、色彩...
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有一张平行四边形纸片ABCD,已知∠B=70°,按如图所示的方法折叠两次,则∠BCF的度数等于( )ADADADFBCBBC A. 55° B. 50° C. 45° D. 40° 相关知识点: 四边形 平行四边形 平行四边形基础 平行四边形的性质 平行四边形的性质——与角相关 平行四边形性质综合应用 四边形综合 平行四边形综合进阶 模型与...
网址:http://m.1010jiajiao.com/gzwl/shiti_id_9d757ed19ea95fbcbbcbadeb6cc6d137 8.体重计上站着一个质量为50kg的人,同时放着一个质量为3kg的物体,当此人用20N的竖直向上提这个物体时(g取10m/s2)( ) A. 体重计的示数减少2kg B. 体重计的示数不会改变 C. 物体受到的合力为10N D. 人对磅秤的...
Schulung: Verwenden Sie berechnete Felder in Access, um Daten aus separaten Feldern wie Vor- und Nachname zu verketten. oder , um Datumsangaben zu berechnen, z. B. Bestelldatum plus fünf Tage.
Calculate values that don’t exist in your data. Specify criteria for queries. For example, combine first and last name data to display in a full name field, like this: [First Name] + " " + [Last Name] The plus signs (+) combine the value in the First Name field,...
摘要: When Hugh Carleton Greene was interviewed by the BBC governors for the job of director general in 1960 it is claimed he was asked one question: "Is it true you're a Catholic?" When Carleton Greene answered in the negative, he was told: "Fine, you've got the job."...
Calculate values that don’t exist in your data. Specify criteria for queries. For example, combine first and last name data to display in a full name field, like this: [First Name] + " " + [Last Name] The plus signs (+) combine the value in the First N...