三元二次方程组怎么解啊?f1=(x-x1)^2+(y-y1)^2+(z-z1)^2-r1(i)^2=0;f2=(x-x2)^2+(y-y2)^2+(z-z2)^2-r2(i)^2=0;f3=(x-x3)^2+(y-y3)^2+(z-z3)^2-r3(i)^2=0;f4= (x-x4)^2+(y-y4)^2+(z-z4)^2-r4(i)^2=0;

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