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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
12/8.1 = 105/m // - 105/m
12/8.1-(105/m) = 0
12/8.1-105*m^-1 = 0
-105*m^-1 = -1.48148148 // : -105
m^-1 = 0.01410935
-1 < 0
1/(m^1) = 0.01410935 // * m^1
1 = 0.01410935*m^1 // : 0.01410935
70.87498715 = m^1
m = 70.87498715
m = 70.87498715
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