H=solve('(1/2)*m*E^2+m*g*D*tan(B)*sin(a)-F/sin(B)-(1/2)*m*H^2=0') H = [ empty sym ]H=solve('(1/2)*m*E^2+m*g*D*tan(B)*sin(a)-F/sin(B)-(1/2)*m*H^2=0')Warning:Explicit solution could not be found.> In solve at 81H =[ empty sym ]怎么解决

H=solve('(1/2)*m*E^2+m*g*D*tan(B)*sin(a)-F/sin(B)-(1/2)*m*H^2=0') H = [ empty sym ]H=solve('(1/2)*m*E^2+m*g*D*tan(B)*sin(a)-F/sin(B)-(1/2)*m*H^2=0')Warning:Explicit solution could not be found.> In solve at 81H =[ empty sym ]怎么解决
H=solve('(1/2)*m*E^2+m*g*D*tan(B)*sin(a)-F/sin(B)-(1/2)*m*H^2=0') H = [ empty sym ]
H=solve('(1/2)*m*E^2+m*g*D*tan(B)*sin(a)-F/sin(B)-(1/2)*m*H^2=0')
Warning:Explicit solution could not be found.
> In solve at 81
H =
[ empty sym ]
怎么解决

H=solve('(1/2)*m*E^2+m*g*D*tan(B)*sin(a)-F/sin(B)-(1/2)*m*H^2=0') H = [ empty sym ]H=solve('(1/2)*m*E^2+m*g*D*tan(B)*sin(a)-F/sin(B)-(1/2)*m*H^2=0')Warning:Explicit solution could not be found.> In solve at 81H =[ empty sym ]怎么解决
大3倍,正方形面积就扩大9倍.

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