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81:9+49:7+5×6:3-(2×6:4+5×4:2-48:8)

Răspuns :

9+7+10-(3+10-6) = 26 - 7 = 19
9+7+30÷3-(12÷4+20÷2-6)
16+10-(3+5×2-6)
26-7
19