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小於300的能被3整除的所有自然數之和是: 3+6+9+…+297=99(3+297)/2=14650 其中即能被3整除、又能被5整除的所有自然數之和是: 15+30+…+285=19(15+285)/2=2850 故:小於300的能被3整除的,但不是5的倍數的所有自然數之和是14650-2850=11800
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