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1、学习学习20以内数的顺数和倒数以内数的顺数和倒数1；.2；.123456789103；.10109 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 14；.10987654321109876543215；.6；. 1 2 3 4 5 6 7 8 9 1011121314157；. 1 2 3 4 5 6 7 8 9 1011121314158；.9；.110；.211；.312；.413；.514；.615；.716；.817；.918；.1019；.1120；.1221；.1322；.1423；.1524；.1625；.1726；.1827；.1928；.2029；.2030
2、；.1931；.1832；.1733；.1634；.1535；.1436；.1337；.1238；.1139；.1040；.941；.842；.743；.644；.545；.446；.347；.248；.149；.1 12 23 34 45 56 67 78 89 910101111121213131414151516161717181819192020202019191818171716161515141413131212111110109 98 87 76 65 54 43 32 21 1倒数倒数顺数顺数50；.2018171513101619141211920191614181715201918171615141351；.171619141292018151311108234567152；.谢谢学习！谢谢学习！53；.
