calculation error
Issue #1070
new
1/(1/(1/0.2425-4)-8)-12 = -4.6e-77 wrong, must be 0
1/(1/(1/(2425/10000)-4)-8)-12 = -4.56e-77 wrong, must be 0
1/(1/(1/(1/(1/(1/0.25636-3)-1)-9)-12)-1)-48 = 1.28156e-73 wrong, must be 0
1/(1/(1/(1/(1/(1/(25636/100000)-3)-1)-9)-12)-1)-48 = 1.281561e-73 wrong, must be 0
