syms k1 k2 k3 L1 L2 L3
eq1=1.5^2-1==k1*0.4^2/(0.4^2-L1)+k2*0.4^2/(0.4^2-L2)+k3*0.4^2/(0.4^2-L3)
eq2=1.51^2-1==k1*0.5^2/(0.5^2-L1)+k2*0.5^2/(0.5^2-L2)+k3*0.5^2/(0.5^2-L3)
eq3=1.52^2-1==k1*0.6^2/(0.6^2-L1)+k2*0.6^2/(0.6^2-L2)+k3*0.6^2/(0.6^2-L3)
eq4=1.53^2-1==k1*0.7^2/(0.7^2-L1)+k2*0.7^2/(0.7^2-L2)+k3*0.7^2/(0.7^2-L3)
eq5=1.54^2-1==k1*0.8^2/(0.8^2-L1)+k2*0.8^2/(0.8^2-L2)+k3*0.8^2/(0.8^2-L3)
eq6=1.55^2-1==k1*0.9^2/(0.9^2-L1)+k2*0.9^2/(0.9^2-L2)+k3*0.9^2/(0.9^2-L3)
[k1,k2,k3,L1,L2,L3]=vpasolve(eq1,eq2,eq3,eq4,eq5,eq6,[k1,k2,k3,L1,L2,L3])
各未知量都解得3个不同的值
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