Doprowadź do najprostszej postaci : (x-3) do pot 2 - 2(5-2x)(5+2x)
oblicz wartosc wyrazenia : 4-(2a-5)-a do 3 + (a+2) do 2 , dla a= -2
rozwiaz rownanie : 1 1/2 ( x - 2/3) = 0,2
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Doprowadź do najprostszej postaci
(x-3)²- 2(5-2x)(5+2x)=x²-6x+9-2(25-4x²)=x²-6x+9-50+8x²=9x²-6x-41
oblicz wartosc wyrazenia :a=-2
4-(2a-5)-a³ + (a+2)²=4-2a+5-a³+a²+4a+4=a²-a³+2a+8
(-2)²-(-2)³+2·(-2)+8=4-(-8)+(-4)+8=4+8-4+8=16
rozwiaz rownanie
1½ ( x - 2/3) = 0,2
3/2(x-2/3)=0,2
3/2x-1=0,2
3/2x=0,2+1
3/2x=1,2
3/2x=12/10
3/2x=6/5
x=6/5 :3/2=6/5·2/3=12/15=4/5=0,8