00614nam a2200181Ia 4500 CTU_218592 210402s9999 xx 000 0 und d 510 S572 The science of numbers simplified : A book of practical short rules in mathematics New York J. L. O'Connor 1900 Addition, Adidition of Numbers in Rotation, Bussiness Rules, Calendar, (Julian and Gregorian),... Toán học,Mathematics Bích trâm, Tuyến Trung tâm Học liệu Trường Đại học Cần Thơ