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数学
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已知实数x、y满足
x−2y−3
+(2x−3y−5
)
2
=0
,求x-8y的平方根.
人气:488 ℃ 时间:2019-08-21 08:23:56
解答
根据题意得,
x−2y−3=0①
2x−3y−5=0②
,
解得
x=1
y=−1
,
所以,x-8y=1-8×(-1)=9,
所以,x-8y的平方根是±3.
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