29
要差是7,超码要有789,如果是在十位数就是:70,81,92,都不是;
就只能是个位:07,18,29;又说是两位数,只有29了...
一个质数是两位数,其数字之差为7,这个质数是多少?
一个质数是两位数,其数字之差为7,这个质数是多少?
要算式!
要算式!
数学人气:110 ℃时间:2019-08-19 18:27:00
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