r和m是数轴上的两个数,问r的大小
1 the distance between m and 0 are 3 times the distance between m and 0
2 12 is the halfway between m and r
我选了C~~答案是E~~~我想来想去觉得是C丫~~~
题目也很奇怪 少敲了好几个字
楼主的条件1很模糊....写错了...我们假设是 the distance between m and 0 is 3 times the distance between r and 0
条件 1: |m| = 3|r|
条件 2: m+r=24
上述方程有两组解答: m=18 r=6; 或者 m=36 r=-12
r和m是数轴上的两个数,问r的大小
1 the distance between m and 0 are 3 times the distance between m and 0
2 12 is the halfway between m and r
我选了C~~答案是E~~~我想来想去觉得是C丫~~~
条件1 是是写错了呀 我暂且当做 r 到 0 的距离是 m 到0 的距离的三倍来做
情况一 m >0 r >0
则有(1)3m=r (2) r-12=12-m --> m=6 r=18
情况二 m < 0 r >0
则有(1)3m=r (2)m+12=r-12 --> m=-12 r=36
所以,r有两个取值。不唯一。故E。
r和m是数轴上的两个数,问r的大小
1 the distance between m and 0 are 3 times the distance between m and 0
2 12 is the halfway between m and r
我选了C~~答案是E~~~我想来想去觉得是C丫~~~
欢迎光临 国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/) | Powered by Discuz! 7.2 |