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D( A )
A = 0
A = 0
A = 0
A in (-oo:0) U (0:+oo)
250 = 10/A-2 // - 10/A-2
2-(10/A)+250 = 0
2-10*A^-1+250 = 0
-10*A^-1 = -252 // : -10
A^-1 = 126/5
-1 < 0
1/(A^1) = 126/5 // * A^1
1 = 126/5*A^1 // : 126/5
5/126 = A^1
A = 5/126
A = 5/126
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