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数学
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xy=50 x+2y=35 x
人气:328 ℃ 时间:2020-04-25 05:55:51
解答
y=(35-x)/2
x(35-x)/2=50
x²-35x+100=0
x=(35±5√33)/2
x<18
所以x=(35-5√33)/2
y=(35+5√33)/4
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