maple解方程出错Error,invalid input:too many and/or wrong type of

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maple解方程出错Error,invalid input:too many and/or wrong type of arguments passed to solve;
e1 := {s1 = sqrt((x-R)^2+y^2+z^2)}; e2 := {s2 = sqrt(x^2+(y-R)^2+z^2)}; e3 := {s3 = sqrt((x+R)^2+y^2+z^2)}; vars := {x,y,z}; solve(e1,e2,e3,vars);这样解会出错Error,invalid input:too many and/or wrong type of arguments passed to solve; first unused argument is {s3 = (x^2+2*x*R+R^2+y^2+z^2)^(1/2)}

e1 := s1 = sqrt((x-R)^2+y^2+z^2); e2 := s2 = sqrt(x^2+(y-R)^2+z^2); e3 := s3=sqrt((x+R)^2+y^2+z^2); vars := {x,y,z}; solve({e1,e2,e3},vars);

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