Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
수학에서 등식은 두 수가 같다는 것을 나타냅니다.suhakeseo deungsik-eun du suga gatdaneun geoseul natanabnida.In mathematics, an equality represents that two numbers are the same.