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1 . Efectueaza suma numerelor folosind descompunerile lor:
a) 1423+3219 b) 7514+12108 c) 251367+324532

2. Calculeaza asezand termenii unul sub celelalt:
a) 7253+2543 b) 800518+39530 c 837043+68739
306413+639585 342514+236462 42090+396705