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Which of the following lists the number of points at which a circle can intersect a triangle?
A.2,6 B.2,4,6 C.1,2,3,6 D.1,2,3,4,6 E.1,2,3,4,5,6
这道题不是很懂题意。。。。
The number of stamps that K and A had are in the ratio 5:3,respectively.After K gave A 10 her stamps,the ratio of the number K had to the number A had was 7:5.As a result of this gift,K had how many more stamps than A.
A.20 B.30 C.40 D.60 E.90
我的思路是:K/A=5/3 K-10/A+10=7/5 然后联立解出K=150,A=90,K-A=60
但是答案是C.40,所以不是很能够理解~~~~求大神指教!!!!!!~~
CD上大神很多,急求大神帮助~~~~~~
好人一生平安~~~~~~~~~~~~
差点忘了,第一道题目的答案是E~~~~~~~~~ |
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