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4,12,24,40,(60) 規律是 4=1*4 12=3*4 24=6*4 40=10*4 1 3 6 10的規律規律是(N的平方+N)/2 所以整體的規律是 (N的平方+N)/2 * 4=2*(N的平方+N) 就是2N的平方+2N
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