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problema de matematica clasa a 2 a 100-3*3:7+21:7+9+(100-8*8)

Răspuns :

100-3x3+21:7+9+(100-64)
100-3x3+21:7+9+36
100-9+3+9+36
100-12+9+36
100-21+36
100-57=43