椭圆的第一定义如何推出第二定义(纯几何,不借助坐标系也不升到三维空间)? 知乎 Template




You need a modern browser try chrome, to view this.

Background image: Hide Show

View Larger Image Image Credit: zhihu.com






Try and sketch some of theseDoor knob, Seaweed, Cuttlefish, Record player, Cabin, Parrot, Wolf, Tarp, Lollipop sucker, Pillbox, view more ideas


please wait, the page is loading...

More Sketches

Take a peek at some of the sketches created by our users, are you a sketchite?

anonymous
anonymous
sketch #4454 Lisa by Muhammad Raiyaan


Lucy Barnard
sketch #245 Fishy


anonymous
anonymous
sketch #1041 strawberries


anonymous
anonymous
sketch #5155


anonymous
anonymous
sketch #3736 Why so serious? by Taï Marsan


anonymous
anonymous
sketch #5189


anonymous
anonymous
sketch #5214 Crying with a Smile by Bill Kody


anonymous
anonymous
sketch #334 DON 'T!


anonymous
anonymous
sketch #2577


anonymous
anonymous
sketch #5121


anonymous
anonymous
sketch #4937 Favorite animal competition runner-up: White Tiger by Deepak Kaushik


anonymous
anonymous
sketch #2877 Elvis by Karoline Castillo


anonymous
anonymous
sketch #1257


anonymous
anonymous
sketch #5198 Sakura Claudio Pose Jester Genso


Na Ruro
sketch #2797 Homer by Na Ruro


anonymous
anonymous
sketch #21243


anonymous
anonymous
sketch #4883 White tiger by Kayson Danielle


anonymous
anonymous
sketch #5123


anonymous
anonymous
sketch #3413 Link by Dã Tr� ng


anonymous
anonymous
sketch #5092 Silvers Rayleigh by Wasim Khan


anonymous
anonymous
sketch #2965 Flapjack by Farzin Hedayatzadeh


anonymous
anonymous
sketch #4582 Pikachu by Mariana Sanchez Acevedo


anonymous
anonymous
sketch #20344


anonymous
anonymous
sketch #4997 Rafael Leite Jose Rondon


愛君
sketch #1964 愛鼠繪


anonymous
anonymous
sketch #3517 Scratch from Ice Age by VlAd Craciun


anonymous
anonymous
sketch #5435


anonymous
anonymous
sketch #4834 Aayla Secura by Nînâ Yämâhä


anonymous
anonymous
sketch #687 Buddha Peace

tomski椭圆的第一定义如何推出第二定义(纯几何,不借助坐标系也不升到三维空间)? 知乎 coloring