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D( x )
x = 0
250/x = 0
x = 0
x = 0
250/x = 0
250/x = 0
250*x^-1 = 0 // : 250
x^-1 = 0
x należy do O
x in (-oo:0) U (0:+oo)
200/(250/x) = (4*x)/5 // - (4*x)/5
200/(250/x)-((4*x)/5) = 0
200/(250/x)+(-4/5)*x = 0
0 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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