Mysterious number 9 (quick, urgent) Less words, less than 50 words, hand copy type, urgent! The sooner the better, It's not necessarily the mysterious number 9, as long as it's a little mathematical knowledge

Mysterious number 9 (quick, urgent) Less words, less than 50 words, hand copy type, urgent! The sooner the better, It's not necessarily the mysterious number 9, as long as it's a little mathematical knowledge

Arabic numerals 1, 2, 3, 4, 5, 6, 7, 8, 9 and 0 are commonly used in the world. The creation of this kind of number is not Arab, but it can not erase the credit of Arab. Arabic numerals were originally created by Indians, and their ancestors gradually created them in production practice. Know treasure house