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va rog sa ma ajutati dau coroana : 40 cm plus ? mm egal 1 m

Răspuns :

40 cm=400 mm
1m=1000 mm
400mm+xmm=1000mm
xmm=1000mm-400mm
xmm=600mm
40 cm=0,4m  |
600mm=0,6m|
=>40cm+600mm=1m