rich1.0engloge reciprocal&number please use! memorize! no camera! (1)gfdsfgdshttps://clara.io/user/gfdsfgdshttps://clara.ioClara.iohttps://clara.io/api/scenes/ac03a872-93bd-49c6-a4f5-5c181e25fb3b/thumbnail.jpg640480640480<iframe width="640" height="480" src="https://clara.io/embed/ac03a872-93bd-49c6-a4f5-5c181e25fb3b" allowfullscreen style="border:0;"></iframe>