字幕表 動画を再生する 英語字幕をプリント - [Voiceover] Welcome to the Khan Academy. The goal of this video is to show you all the different things that Khan Academy has. It has videos, it has exercises, it has an adaptive, super, I guess you could call it robot tutor thing that will guide you through content and make sure you master it. So let's just take each of those one by one. Many of y'all are probably coming to this saying, "Hey, I have an exam tomorrow on DNA," or "I didn't understand quite what's happening in class." There the best thing to do might just be go to the search bar, let me make sure you can see the search bar, to go to the search bar and you could search for DNA. When you do that you see your first choice right over is a DNA video. This is actually the main video on DNA and which you could start watching. Or if you look to the right right over here, you see that there's all other related videos under heredity and genetics. Then you can start browsing from there. You could say, "Okay, let me back up a second. "Let me go back to just all of biology." I can see all of the sections are there. Similarly, you might wanna search for something in mathematics. You might wanna say, "Oh, I have a question "about quadratics." Quadratics. I'm gonna do a search there. Okay, well let's see, there's something about using the quadratic formula, factoring quadratics 2. I don't know which of these is right for me, so let me just go into one of these and start getting a little bit of context. You see that what I actually just clicked on is actually an exercise that gets me to solve quadratics by factoring two. I need to write my answer here. If I don't know the answer, I have a bunch of hints. If this all looks like Greek to me, I can click on a video that solves a very similar problem. Or I might hey, this isn't what I was looking for. But look over here, they're solving a quadratic equation by factoring. Factoring quadratic equations. Maybe this is what I need to learn. Or maybe I'm not even thinking about this stuff, so let me just move up a level to quadratic equations. Now I can see the whole topic here. Solving quadratics by taking square root. Solving quadratics by factoring. Completing the square, the quadratic formula. Quadratic equation, graphing quadratics. In general if you just wanna browse, you say "Let me just see all the subjects "that are available on Khan Academy." You can go this drop-down right over here. This starts to give you a sense of the breadth of the content on Khan Academy. Just in math, each of these is an entire subject. K-2nd math, you have pre-calculus, goes all the way up to multivariable calculus, intergal calculus. If I were to click on any one of these things, it's going to take me into something called a mission. A mission is going to give me a set of exercises. We call this right over here the mission warm-up. Based on how I perform on these calculus questions, the system is starting to get a sense of what I know and don't know and it will use that to give me guided practice so I can learn more and more and more calculus. Eventually mastering calculus. At any point if I have difficulty, there's always videos here that will help me understand the actual calculus. Once I'm done with that, I will go to this dashboard and it'll just tell me about how much have I progressed in integral calculus, what have I mastered, what have I not practiced yet, what are my different badges. If you do not wanna move immediately into this mission world and you wanna say what does Khan Academy have when it comes to calculus in an unguided way, that's where you go view full list of integral calculus content. Then you will go to this page, where you see the breadth and scope of the integral content. Integrals, integration techniques, integration applications, sequences and series, AP calculus practice problems. If you click there, you see the different tutorials within, indefinite integrals as anti-derivative, area under a rate function as net change. Hopefully that gives you sense of things. We don't just have math and we don't just have science, we have whole section here on computer programming, which is tons of fun where you can write your own computer program. I'm using my son's account right now. This is a computer program that we wrote. This right here is a computer program that we wrote together the other day. It was good father/son bonding time. And we have things in the arts and humanities, like history and art history, which is also very, very, very exciting. And we have partner content. We have partner content from the likes of The Museum of Modern Art, Explortorium, JP Getty Museum, The British Museums. So a lot of stuff here. Hopefully this video gives you a flavor of the different ways you can use Khan Academy.