Introduction - If you have any usage issues, please Google them yourself
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function Rguji = shixi2_2 (t, thetaa1, thetaa2, thetab1, thetab2, thetac, mm)
t is the survival of life requires a system element A1 thetaa1 is the mathematical expectation
thetaa2 element A2 is the mathematical expectation thetab1 element B1 is the mathematical expectation
thetab2 element B2 is the mathematical expectation thetac component c is the mathematical expectation