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标题: jj 213 [打印本页]

作者: kangchia 时间: 2006-10-23 06:23
标题: jj 213

r^2+s^2=0

(1) r+s=0

only 0

(2)3r^2+4^2=0

only 0

i feel the answer d

does any one have other opinions??

作者: ondesert 时间: 2006-10-23 06:28
r,s　如果是相反数的话（比如２和－２）那相加是０，但平方相加就不是０了，所以（１）应该不对吧

作者: kangchia 时间: 2006-10-23 06:28

sorry

i know i am wrong now

sorry

i am a stupid man

sorry

作者: cpcjustin 时间: 2006-10-23 13:46
B

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