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±50 +2×{447:8+3×[9+5×(306: 17-288: 18(]}

Răspuns :

50+2×{477:9+3×[9+5×(18-16)]}=

50+2×[477:9+3×(9+5×2)]

50+2×(477:9+3×19)

50+2×(53+57)

50+2×110

50+220

=270

Si daca e cu -50 se face tot asa doar ca la ultimul pui -50+220=170