3.
[tex]60cm = 12a\\a = 5\\V = a^3 = 5^3=125cm^3[/tex]
Odp. A
4.
[tex]90l = 90dm^3\\45cm = 4,5dm\\0,5m = 50cm = 5dm\\90dm^3=4,5dm*5dm*x\\90dm^3=22,5dm^2*x\\x = 90dm^3:22,5dm^3=4dm\\x = 4dm = 40cm[/tex]
Odp. 40cm
5.
[tex]a = 9\\H = 2\\Pc = 2Pp + 4Pb\\Pp = a^2=9^2=81\\Pb = a*H = 9*2=18\\\\Pc = 2*81+4*18=162+72=234[/tex]
Odp: 234
6.
1)
Suma dlugosci krawedzi bocznych: 4*8cm=32cm
Suma krawedzi podstawy: 8*4cm = 32cm
Falsz
2)
Pole sciany bocznej: [tex]8cm*4cm=32cm^2[/tex]
Pole podstawy: [tex]4cm*4cm=16cm^2[/tex]
[tex]32cm^2:16cm^2=2[/tex]
Prawda
3)
[tex]Pc = 2*4*4+4*4*8=32+128=160cm^2\\Pp = 4*4=16cm^2\\160 = 100%\\16 = x\\x = 16*100/160=1600/160=10[/tex]
Prawda
4)
[tex]V = 4*4*8=128cm^3\\V:2=128cm^3:2=64cm^3[/tex]
Prawda
