(1)已知△ABC的顶点A(1,1),B(3,2),C(2,4),求△ABC的面积.(2)若△ABC的顶点A在直线y=x上
(1)由两点间的距离公式可得,AB=5,BC=5,AC=10∴AB2+BC2=AC2即AB⊥BCS△ABC=12AB?BC=12×5×5=52(2)由题意可设A(a,a),C(b...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
如图,在直角坐标系中,△ABC三个顶点的坐标分别为A(1,1)、B(2,地另通亚培2)、C(3,1).来自(1)判断△ABC的形
(1)∵A(1,1)、B(2,2)、C(3,1),∴AB=(2?1)2+(2?1)2=2,AC=(3?1)2+(1?1)2=2,BC=(3?2)2+(1?2)2=2,∵AB2+B...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
blendet怎么添加圆环顶点
首先打开blender,在里面创建任意一个网格模型;选中立方体,进入编辑模式,并且切换到正交前视图;选择左上角的选择模式中的点选择选项;选择左边的工具列表中的移动工具;按住键盘上...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
已知正方体ABCD、EFGH的棱长为1,现从8个顶点中随机取3个点构成三角形,设随机变量X表示取出的来自三角形的面
(I)从正方体的8个顶点中任材错频限接渐剧举重行意取3个构成三角形的顶360问答点共有C38种取法其中X=12的三角形如图中的△ABC,这类三角形共有24个∴P(X=12)=24...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
已知与抛物线x2=4y有相同的焦点的椭圆E:y2a2+x2b2=1(a来自>b>0)的上下顶点分别为A(0,2),B(0,-2)
(1)由抛物线x2=4y,可得焦点(0,1).∴c=1,由椭圆E:y2a2+x2b2=1(a>b>0)的上下顶点分别为A(0,2),B(0,-2),可得a=2,∴b2=3.∴椭圆...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
设棱长为1的正方体为图形C1,以C1各个弱胜座压书则她溶按统国面的中心为顶点的正八面体为图形C2,以C2各个面的中心为顶点的正方
(1)正方体C1各面中心为顶点的凸多面体C2为正八面体,它的中截面(垂直360问答平分相对顶点连线的界面)是正方形,该正方形对角线长等于正方体的棱长,所以它的棱长a2=12=22...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
椭圆x24+y23=1的上,下顶点分南够顶革创希语刚损别为A1,A2,左顶点为B语甚货翻停印至犯1,左焦点为F1,若直线A1F1交直线A2B1氧毛讨要到够钱九于点D,则cos∠B
∵椭圆x24+y23=1的上,下顶点分别为A1,A2,左顶点为B1,左焦点为F1,∴A1(0,3势指风务延兵全蛋聚虽),A2(0,-3配才),左顶点为B1(-2,0),左焦点为F...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
怎么用qq空间免费播放器的代码
播放器代码************问答t:window.***.space_addItem(6,1228,0,0,200,2晚称质缩演00,0);水晶配品脱刚顶点么毫升蓝QQ空间...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
《蒙面之城》txt下载在线阅读,求百度网盘云资源
《蒙面之城》(宁肯)电子书网盘下载免费在线阅读资源链接:书名:蒙面之城作者:宁肯豆瓣评分:8.5出版社:作家出版社出版年份:******页数:499内容简介:一段漫长而沉思的生命...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
如何免费获取苹果iWork,iLife等正版软件
本方法其实利用了苹果MacAppStore的一个bug,虽然并不知道这是否苹果故意留下来的,但无论怎么样,只要一旦你的帐号获取过一次iWork和iLife软件,那么以后就相当于永...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
精雕软件画个圆为什么看着不是圆形的调了分辨路也不行
卡尺卡一下就知道了吗?还有,精雕5.5一下的版本,完美支持分辨率是1440x900,如果你用1920x1080分辨率的显示器没办调节到1440x900所以你的院不阶厚胞纪操介蒸会...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
几何画板和GeoGebra比较,哪个好用
推荐使用GeoGebra,优势如下:免费开源几何画板是付费软件,而GeoGebra是免费、开源软件。越来越人使用Geo来自Gebra最新的人教版数学教材已经有GeoGebra的身...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)
几何画板和GeoGebra比较,哪个好用
推荐使用GeoGeb来自ra,优势如下:免费开源几何画板是付费软360问答件,而GeoGeb而范四教ra是免费、开源软件。越来越人使用GeoGebra最新的人去庆务喜听州教版数学...
展开阅读全文 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAG1BMVEUAAABuk71wj79vkr1wj79wn79vlL1vk75vk73EmhGbAAAACHRSTlMA0BDfIBDfv/U9wHQAAABISURBVBjTY6AlYBOC0OEJQIK9UQHEZpUQAJJMEmCpQIiYIohiBQlBpKASUCmwBETKQiiw2QFmunOjhAncKhYLkARcCihBWwAA5n0JqdkCrS4AAAAASUVORK5CYII=)
收起 ![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYBAMAAAASWSDLAAAAHlBMVEUAAABuk71wj79vlL1wl79wn79vkr1vlL5vk75vk71klGr6AAAACXRSTlMA0BDfIBDfv7/eQcl1AAAARklEQVQY02OgNXA2QbBZLCc7ICQmSpogJIQUJytAOYETFZgkhSBsVhBDcaICRAJEA6XgEjApRhAJkmoAkmxFEK2KCQw0BAA5Lgp0ywp4owAAAABJRU5ErkJggg==)