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4的组成与加减,4,3,1,4,1,3,4,2,2,4,2,2,4,3,1,4,1,3,1 + 3 = 4,2 + 2 = 4,3 + 1 = 4,4 - 1 = 3,4 - 2 = 2,4 - 3= 1,+,=,1 + 3 = 4,-,=,4 - 1 = 3,2 + 2 = 4,+,=,=,4 - 2 = 2,-,3 + 1 = 4,4 - 3 = 1,4,1,4,3,3,1,3,1,1,3,4,4,4,2,4,2,2,2,2,2,2,4,4,4,3,4,1,1,3,2,2,2,4,4,2,3,1,4,4,3,1,2,2,4,4,2,2,1,3,4,4,2,2,2,4 - = 2,- 2 = 2,3 + = 4,3 + 1 =,+ 1 = 4,4 - 3 =,4 - = 1,- 3 = 1,+ 3 = 4,1 + = 4,4 - = 3,4 - 1 =,- 1 = 3,2 + 2 =,2 + = 4,+ 2 = 4,4 - 2 =,1 + 3 =,4,1,3,3,1,4,4,2,2,2,2,4,4,1,3,1,3,4,