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10加几与相应的减法,15,15,10,5,10,+,7,17,7,+,10,17,17,-,7,10,17,-,10,7,12,12,10,2,19,19,9,10,16,8,14,11,3,10,3,6,15,+,10,4,14,-,13,3,10,13,15,13,15,17,19,20,18,17,16,14,13,18,14,15,16,17,14,6,5,15,18,10,10,13,3,9,10,5,10,2,1,2,3,
