x = ± 7
But if x=√100
then
x=10
我想問sq.rt. 100 點解唔係± 10 ge...
更新1:
Stupid me... I still don't understandT^T x=√100 x^2 =100 x= ±10 or x=√100 x=√ (-10)^2 x^2= 100 x=±10 I know it is(may be) wrong, can you explain why please
Stupid me... I still don't understandT^T x=√100 x^2 =100 x= ±10 or x=√100 x=√ (-10)^2 x^2= 100 x=±10 I know it is(may be) wrong, can you explain why please
收錄日期: 2021-04-23 23:06:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081107000051KK00363