4 - 2+2, 12 - 3+3+3+3, 8 - 2+2+2+2, 10 - 5+5, 9 - 3+3+3, 15 - 5+5+5, 6 - 3+3, 20 - 4+4+4+4+4,

数学 连加法 Std_1

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