帮帮新手,谢谢
 

l1*cos(c1)=s3*cos(c3)
l1*sin(c1)+l2=s3*sin(c3)
-l6=s5*cos(c3)
l4=s5*sin(c3)
s3 s5 l6 c3 未知 用 c1变量表示 l1=89.6 l2=348 l4=679

>> [c3,l6,s3,s5]=solve('89.6*cos(c1)-s3*cos(c3)','89.6*sin(c1)+348-s3*sin(c3)','l6+s5*cos(c3)','679-s5*sin(c3)','c3,l6,s3,s5')

c3 =

atan(-1.*(112.*sin(c1)+435.)/(97440.*sin(c1)+201769.)*(-1.*(97440.*sin(c1)+201769.)*(sin(c1)^2-1.))^(1/2)*cos(c1)/(sin(c1)^2-1.),112./(97440.*sin(c1)+201769.)*(-1.*(97440.*sin(c1)+201769.)*(sin(c1)^2-1.))^(1/2))
atan(1.*(112.*sin(c1)+435.)/(97440.*sin(c1)+201769.)*(-1.*(97440.*sin(c1)+201769.)*(sin(c1)^2-1.))^(1/2)*cos(c1)/(sin(c1)^2-1.),-112./(97440.*sin(c1)+201769.)*(-1.*(97440.*sin(c1)+201769.)*(sin(c1)^2-1.))^(1/2))



l6 =

-76048./(112.*sin(c1)+435.)*cos(c1)/(-1./(97440.*sin(c1)+201769.)*(12544.*cos(c1)^2*sin(c1)^2+97440.*cos(c1)^2*sin(c1)+189225.*cos(c1)^2+12544.*sin(c1)^4-25088.*sin(c1)^2+12544.)/(sin(c1)^2-1.))^(1/2)
-76048./(112.*sin(c1)+435.)*cos(c1)/(-1./(97440.*sin(c1)+201769.)*(12544.*cos(c1)^2*sin(c1)^2+97440.*cos(c1)^2*sin(c1)+189225.*cos(c1)^2+12544.*sin(c1)^4-25088.*sin(c1)^2+12544.)/(sin(c1)^2-1.))^(1/2)



s3 =

-.80000000000000000000000000000000*(-1.*(97440.*sin(c1)+201769.)*(sin(c1)^2-1.))^(1/2)*cos(c1)/(sin(c1)^2-1.)
.80000000000000000000000000000000*(-1.*(97440.*sin(c1)+201769.)*(sin(c1)^2-1.))^(1/2)*cos(c1)/(sin(c1)^2-1.)



s5 =

-679./(112.*sin(c1)+435.)*(-1.*(97440.*sin(c1)+201769.)*(sin(c1)^2-1.))^(1/2)*cos(c1)/(sin(c1)^2-1.)
679./(112.*sin(c1)+435.)*(-1.*(97440.*sin(c1)+201769.)*(sin(c1)^2-1.))^(1/2)*cos(c1)/(sin(c1)^2-1.)


[SIZE="5"][SIZE="6"]以上是我的程序和结果 ,可是 c3的图不对.有高手能帮我解决难题吗 ?[/SIZE][/SIZE]