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-Drake-

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[求助] 求大神算下三元二次回归方程极大值及对应自变量取值,谢谢

Excel规划求解装不上,烦请大神帮忙算下以下方程的极大值及对应自变量取值,并说明用什么软件或方法计算的,谢谢!!
范围:5≤x1≤15,   5≤x2≤30,   50≤x3≤90
y1=-59.556+14.773x2-0.058x2x3-0.279x2x2+0.008x3x3
y2=44.931-2.365x2+0.011x2x3+0.056x2x2-0.003x3x3

y1(max)=?  x1=?  x2=?  x3=?
y2(max)=?  x1=?  x2=?  x3=?
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