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Intr-un vas in forma de cub cu muchia de 20 cm incap ... litri de apa.

Răspuns :

[tex]20cm=2dm \\ V _{cub} =l ^{3} =2 ^{3}=8dm ^{3} \\ ........................................................ =\ \textgreater \ \\ V_{cub}=8l \\1dm ^{3}=1l [/tex]
V = L*L*L
V =20*20*20 =800 cm^
800cm^2 =800:10^2 =800:100 = 8 dm^3 =8 litri