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6. Calculează:
a) 10 m + 10 m
80 cm + 10 cm
10 dm + 20 dm
b) 12 cm : 2
8 mx3
5 mm + 4 mm
c) 54 m : 6
9mx5
100 cm - 20 cm
d) 100 cm - 40 cm
70 cm - 30 cm
10 dm x 10





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