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Calculati, folosind proprietatile adunarii:
a) 75+138+25,
b) 4+90+106,
c)197+2457+3,
d) 23+78+27+22,
e)11+12+13+14+15+16+17+18+19.

Răspuns :

CatalinaMihaela
a) 75+138+25=
   213+25=
   238

b) 4+90+106=
   94+106=
   200

c) 197+2457+3=
    2654+3=
    2657

d) 23+78+27+22=
   101+49=
   150

e) 11+12+13+14+15+16+17+18+19=
    23+27+31+35+19=
    50+66+19=
    116+19=
    135.

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