Does the integer K have at least three different positive prime factors?(1) K/15 is an integer (2) K/10 is an integer
çæ¡æ¯C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
书éç»ç解éæ¯(1) prime factors of 15 are 3 and 5, so in this case k has least 2 different positive prime factors, but it is unknown if there are more positive prime factors;NOT sufficient. åç(2) has at least 2 positive prime factors , 2 and 5. and (1)+(2) must be divisible by 2, 3, and 5. æ以çæ¡æ¯Cã
ä½æ¯æ¥¼ä¸»çå°ææ¯ integer k ä¼ä¸ä¼æ¯positive integerå¢ï¼å¨(1)+(2)æ
åµä¸ï¼å¯è½ k= -30 , k/15åk/10é½æ¯è´æ´æ°ï¼è´æ´æ°ä¹æ¯æ´æ°å§....楼主就æ¯çº ç»å¨è¿ä¸ªç¹ä¸ORZï¼ï¼é£kçprime factorså°±å¯è½æ¯ -2, -5ï¼-3è¿æ ·çå......楼主è¿ä¹æ³çäºæ¯éäºé误çæ¡E Statement (1)and(2) TOGETHER are not sufficient.....ORZ解é太ç®åï¼æ¥¼ä¸»èªå·±ç»ä¸åºå»äºãããæ±å©çå¿è å°ä¼ä¼´è§£æ..... QAQ
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