va rog sa imi arătati in scris cum se face

Răspuns:
a) 10dm-4dm=6dm
1000mm+770mm=239mm
b)10dm-9dm=1dm(10cm)
100cm-80cm=20cm(2dm)
c)6m+10dm+300cm=100dm
=60dm+10dm+30dm
=100dm
9dm+10cm+2000mm=3m
=9dm+1dm+20dm
=30dm(3m)