标题: Q122 on JJ?????? [打印本页] 作者: romi0813 时间: 2010-8-18 09:32 标题: Q122 on JJ?????? confused abt the answer for question 122 on JJ.....the JJ shows that the answer is A but I think B or maybe D is the correct one. since we already knew Y^2=16/9, then we can easily get what a is!!!!!!
can someone please explain this question for me?????
Thanks sooooooooo much 作者: azhouruiqi 时间: 2010-8-18 09:41
2的话，代入y平方求出x平方等于十六分之二十五，能求出X有两个解，但不能确定哪一个，错作者: romi0813 时间: 2010-8-18 10:30
thanks for helping
