Số?
5kg + ...kg + ...kg + ...kg =...kg
...l + ...l + ...l + ...l + ...l=...l
c)
...dm + ...dm + ...dm=...dm
a) 5kg + 5kg + 5kg + 5kg = 20kg
b) 3l + 3l + 3l + 3l + 3l = 15l
c) 20dm + 20dm + 20dm = 60dm
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