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10+[68:4-3(2la puterea 5-3 la puterea 3)]•9

Răspuns :

10+[68/4-3(2^5-3^3)]*9=
10+[17-3(32-27)]*9=
10+[17-3*5]*9=
10+(17-15)*9=
10+2*9=
10+18=28