1) 40min-...cm.
2) 3 kg-...g
3) 3h/20min-40min=...s Dau corona!!!​


Răspuns :

[tex]1) \ 40 \ m=4 \ 000 \ cm; \\ 2) \ 3 \ kg=3 \ 000 \ g; \\ 3) \ 3 \ h \ 20 \ min-40 \ min=180 \ min+20 \ min-40 \ min=160 \ min.[/tex]