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solve求解方程组出问题,求支招

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发表于 2016-6-25 14:33:02 | 显示全部楼层 |阅读模式 来自 湖南湘潭
[U,P,Q,D]=solve('U*4/4950=1-(P/6125600000-1)*2.45/(4*P/6125600000+2)^0.5','U^2=P(1/2730-1/Q)','P=2730*D*U','D-4000-1.32*U=0')
明明有4个方程4个未知数,但是不知道为什么总这样提示
Warning: 4 equations in 3 variables.
> In D:\STUDYSOFTWIRE\MATLAB\toolbox\symbolic\symbolic\symengine.p>symengine at 54
  In mupadengine.mupadengine>mupadengine.evalin at 97
  In mupadengine.mupadengine>mupadengine.feval at 150
  In solve at 160
  In Untitled at 8
Warning: Explicit solution could not be found.
> In solve at 169
  In Untitled at 8

U =

[ empty sym ]


P =

     []


Q =

     []


D =

     []

求支招,谢谢








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