Wyznacz wartosc wyrazenia W(x)= 2x/ x-3 (kreska ulamkowa i pod nia x-3)
dla x=√7 (pierwsiastek z 7)
W(√7)=2√7 : √7-3
W(√7)= [2√7*(√7+3)]:[(√7-3)*(√7+3)]
W(√7)=(14+6√7):(7-9)
W(√7)=-7-3√7
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W(√7)=2√7 : √7-3
W(√7)= [2√7*(√7+3)]:[(√7-3)*(√7+3)]
W(√7)=(14+6√7):(7-9)
W(√7)=-7-3√7