Let a,b,c,and d be real number with |a-b|=2 b-c=3 c-d=4 .What is the sum of all possible values of a-d? 答案为一个数答案为18 我也不明白 a减d
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Let a,b,c,and d be real number with |a-b|=2 b-c=3 c-d=4 .
What is the sum of all possible values of a-d? 答案为一个数
答案为18 我也不明白 a减d
|a-b|=2 b-c=3 c-d=4 .是这条题目关于a、b、c、d的关系,题目是要你求出a、b、c、d的和.
a=7 b=9 c=6 d=2 a+b+c+d=24 不信你可以验证一下.
那个不是a减d的意思,是要你求出a~d的可能值的和.
"possible"暗示了此题有好几个答案.
什么是广告的所有可能值的总和?
14
14
题目的意思可能是a-d的两种情况的总和
∵|a-b|=2
∴a-b=±2
∴①当a-b=2时,a-d=a-b+b-c+c-d=9
②当a-b=-2时,a-d=a-b+b-c+c-d=5
∴总和为14
应该是14才对吧!a-d=a-b+b-c+c-d=(a-b) + (b-c)+(c-d)=(a-b)+7;|a-b|=2 => a-b = 2或者a-b=-2;
所以最后的值为14.
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