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计算:8-9+10-11+26-41+42=______.计算:8-9+10-11+26-41+42=______.

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下列数:1,11,21,31,41,51,61,71,81,91中,素数有______个.下列数:1,11,21,31,41,51,61,71,81,91中,素数有______个.

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