oblicz wartosc liczbowa wyrazenia:
a)(- 1/x+ x³)² * 8/25 (osiem dwudziestych piątych) x= -½
b)√-4x³+12y-5z (pierwiastek do konca dzialania) y=⅙ z= -6 x=-1
w a) ma wyjsc 1 1/8 ,w b)6
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a)(-1/x + x³)² * ⁸/₂₅ dla x = - ½
= [-1/- ½ + (- ½)³]² * ⁸/₂₅ = (2 - ⅛)² * ⁸/₂₅ = (1⅞)² * ⁸/₂₅ = (¹⁵/₈)² * ⁸/₂₅ = ²²⁵/₆₄ * ⁸/₂₅ = ⁹/₈ = 1⅛
b)√-4x³ + 12y - 5z dla x = -1 , y = ⅙ , z = -6
=√-4*(-1)³ + 12*(⅙) - 5*(-6) = √4 + 2 + 30 = √36 = 6