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D( x )
x = 0
50/x = 0
x = 0
x = 0
50/x = 0
50/x = 0
50*x^-1 = 0 // : 50
x^-1 = 0
x należy do O
x in (-oo:0) U (0:+oo)
1000/(50/x) = 200 // - 200
1000/(50/x)-200 = 0
20*x-200 = 0 // + 200
20*x = 200 // : 20
x = 200/20
x = 10
x = 10
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