分别把下列个数分解素因数 18,32,45,51,75,84,把下列个数填入适当的圈内1,2,3,4,5,7,9,11,15,21,27,29,39,41,46,51,87.奇数（ ）偶数（ ）素数（ ）合数（ ）

18=2*3*332=2*2*2*2*245=3*3*551=3*1775=3*5*584=2*2*3*71,2,3,4,5,7,9,11,15,21,27,29,39,41,46,51,87.奇数（ 1,3,5,7,9,11,15,21,27,29,39,41,51,87）偶数（2,4,46）素数（2,3,5,7,11,13,29,41,）合数（4,9,15,21,...