BAC GIANG SPECIALIZING UPPER SECONDARY SHOOL NGUYEN VAN TIEN, BACH DANG KHOA NGUYEN DANH HAO, TRAN THI HA PHUONG, TRAN ANH DUC COLLECTION EXAMPLES and EXERCISES FOR TEAM COMPETITIONS HOMO & SOMO (FOR STUDENTS IN MATH 10 GRADE) This colection is part of the scientific research of the group’s of mathematics teachers in Bac Giang Specializing Upper Secondary School BAC GIANG, 28/11/2012