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2,4,6,8,10,12,16,18,20,28,30 6,2,10,4,8,12,28,30,20,16,18 12,2,10,20,6,18,4,16,30,8,28 30,10,20,12,2,4,16,6,8,28,18
(-1,5), (5,5), (6,-2)的圆的方程是( ) A.x2+y2+4x-2y-20=0 B.x2+y2-4x+2y-20=0 C.x2+y2-4x-2y-20=0 x2+y2+4x+4y-20=0
1 2 3 4 5 6 1 4 2 5 3 6 6 5 4 3 2 1 6 3 5 2 4 1
1 2 3 4 5 6 1 4 2 5 3 6 6 5 4 3 2 1 6 3 5 2 4 1
1~2天与1~2岁 2~4天与2~4岁 4~6天与4~6岁 6~8天与6~8岁 8~20天与8~10岁
5,10,15,20 2,6,10,14 2,4,6,8 5,8,11,14
30,28,20,12,18,16,4,10,2,6,8 20,30,28,12,18,4,16,10,2,8,6 2,6,4,10,8,28,16,30,20,12,18 2,4,10,6,12,28,16,20,8,30,18
2,4,6,8,10,12,16,18,20,28,30 6,2,10,4,8,12,28,30,20,16,18 12,2,10,20,6,18,4,16,30,8,28 30,10,20,12,2,4,16,6,8,28,18
4-6个月、1.5岁、18 4-8个月、2岁、20 4-10个月、2岁、20 6-10个月、3岁、24
10,6,18,8,4,2,12,20,16,30,28 1,12,10,20,6,18,4,16,30,8,28 2,4,6,8,10,12,16,18,20,28,30 30,10,20,12,2,4,16,6,8,28,18
10,6,18,8,4,2,12,20,16,30,28 1,12,10,20,6,18,4,16,30,8,28 2,4,6,8,10,12,16,18,20,28,30 30,10,20,12,2,4,16,6,8,28,18
10,6,18,8,4,2,12,20,16,30,28 6,2,10,4,8,12,28,30,20,16,18 2,4,6,8,10,12,16,18,20,28,30 6,10,8,28,20,18,2,4,12,30,16
1 2 3 4 5 6 1 4 2 5 3 6 6 5 4 3 2 1 6 3 5 2 4 1
10,6,18,8,4,2,12,20,16,30,28 1,12,10,20,6,18,4,16,30,8,28 2,4,6,8,10,12,16,18,20,28,30 30,10,20,12,2,4,16,6,8,28,18
2,4,6,8,10,12,16,18,20,28,30 6,2,10,4,8,12,28,30,20,16,18 12,2,10,20,6,18,4,16,30,8,28 30,10,20,12,2,4,16,6,8,28,18
0-10、2-4 6-14、2-4 14-20、2-4 0-6、2-4
2,12,16,8,28,30,4,6,10,18,20 2,12,16,30,8,28,4,10,6,20,18 12,2,16,8,28,30,4,6,10,28,18 12,2,10,20,6,18,4,16,30,8,28