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3124 mm^2-0.12 dm^2+0.07 m^2
va rog urgent


Răspuns :

1dm-100mm; 1m=1000m ;0,12dm=12mm; 0,07m=70mm

=6248mm-12mmx2+70mmx2=6238mm-24mm+140mm==6214mm+140mm=6354mm=6,354m