Odpowiedzi

2009-11-16T14:25:40+01:00
Zadanie1
= (4/3)+(4)²/(¼+½+1+2+4)=
=(4/3+16)/(¾+7)=
=(52/3)/31/4=
52/3*4/31=208/93=2,23

Zadanie 2

=(x+y)²+(x²-y²)=x²+2xy+y²+x²-y²=2x²+2xy=2x(x+y)
dla x=³√125=5 , y=½ mamy
2*5(5+½)=10*11/2=55

Zadanie3
3x²≥25/:3
x²≥25/3
x≥5/√3
x≥5√3/3

Zadanie 4
√9/2-√5=3*(2+√5)/(2²-(√5)²)= 6+3√5/-1=-6-3√5