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[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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