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学习20以内数的顺数和倒数,1,2,3,4,5,6,7,8,9,10,10,9,8,7,6,5,4,3,2,1,10,9,8,7,6,5,4,3,2,1,10,9,8,7,6,5,4,3,2,1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,倒数,顺数,20,18,17,15,13,10,16,19,14,12,11,9,20,19,16,14,18,17,15,20,19,18,17,16,15,14,13,17,16,19,14,12,9,20,18,15,13,11,10,8,2,3,4,5,6,7,1,谢谢学习！,
