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12. Află necunoscutele de mai jos.
a) a dm - 46 dm = 13 dm
353 hm-b hm = 326 hm
ccm + 491 cm = 628 cm
630 mm + d mm = 910 mm
6 dam xe = 936 dam
96 km :f = 3 km
gm : 729 m
b) 17 mm x a - 15 mm = 36 mm
229 dm x b + 43 dm = 730 dm
chm - 23 hm x 3 = 178 hm
185 km :d + 9 km x 0 = 5 km
325 cm + 179 cm - 36 cm : e = 498 cm
76 dam - 19 dam + f dam = 74 dam
129 m: 3+94 m - gm = 105