http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Trình bày 8 phương pháp giải toán theo thứ tự: Phương pháp sơ đồ đoạn thẳng; Phương pháp rút về đơn vị và phương pháp tỉ số; Phương pháp chia tỉ lệ; Phương pháp thử chọn; Phương pháp khử; Phương pháp giả thiết tạm; Phương pháp thay thế; Phương pháp ứng dụng nguyên lí Đi-rích-lê