내용을 입력하세요 익힘책문제 2개 9번 https://drive.google.com/file/d/1jbp2HZVabqvCp-PsAcEBDJ-tOxbRmei1/view?usp=drive_link 17번 https://drive.google.com/file/d/1KX0WHHFjSz1bDANsLuKgpuPaG7WK3els/view?usp=drive_link 전송