(1) The distance between r and 0 is 3 times the distance between m and 0;
(2) 12 is halfway between m and r.
我选了C,但答案是E。哪位NN解答一下吧?谢谢!!
(1)不充分,r可以大于0,也可以小于0。
(2)单独也不充分,不知道m or r的具体值
1&2, 也不行,m>0, 3om=or,get the key: r=18; m<0, get the other key: r=36.
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