How solve

[parisse]

You can help solve by rewriting the system as a rational system

Code:

solve([(1-x*t) = (100/z),(1-x*t^2) = (150/z),(1-x*t^3) = (250/z)],[x,t,z])

then

Code:

solve(e^(-50*y)=t,y)

fsolve also works with a real starting point

Code:

fsolve([(1-x*e^(-50*y)) = (100/z),(1-x*e^(-100*y)) = (150/z),(1-x*e^(-150*y)) = (250/z)],[x,y,z],[-0.1,-0.1,0.1])