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calculeaza respectand ordinea efecuarii operatiolor.285-28:4+9×5-150=; 10×26-18×5+16:2=; 1879+4×3:2-318×5=; 347+869-405-5×18:9=; 56:7×25+38×10×9-1786=; 4205-15×34+70:7×48=