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3(x-3)(x+3)=3(x²-9)=3x²-27
zad2.
P=a+b h =(ah+bh)/2=ah/2+bh/2
2
ah/2=P-bh/2=(2P-bh)/2
ah=2P-bh
a=(2P-bh)/h
Zad.3
1/2 216³+(5,27∧-10)∧0-81∧3/4 x 0,5∧(-1)=
1/2(∛216)² +1-(√√81)³x10/5=
1/2x6²+1-3³x2=18+1-18=1
Zad.4
log5√5 (5√√5)
(5√5)∧x=5√√5
(5x5∧1/2)∧x=5x5∧1/4
(5∧3/2)∧x=5∧5/4
(3/2)x=5/4
12x=10
x=10/12=5/6
Zad.5
2(x-5)²-(x+3)²=2(x²-10x+25)-(x²+6x+9)=2x²-20x+50-x²-6x-9=
x²-26x+41
Zad.6
(8/5)³-(8/5)²x=(14/5)³x
(14/5)³x+(8/5)²x=(8/5)³
x[(14/5)³+(8/5)²]=(8/5)³
x=(8/5)³/(14/5)³+(8/5)²
Zad.7
Suma lat zawodników -x
x/11=22 x=22x11=242
y-wiek trenera
(x+y)/12=25
(242+y)/12=25
242+y=25x12=300
y=300-242=58
Trener ma 58 lat