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a)(2+2x3)x{2x2laputerea2x2laputerea43-2laputerea46+[3laputerea148:3laputerea43-(3laputerea5)laputerea21]+16};
b)122+12x{183:[(2x3laputerea2x5laputerea3)laputerea4:(2laputerea4x5laputerea12)+(2laputerea8)laputerea9:2laputerea72-1laputere27x5laputerea0]-laputerea9x(54-2laputerea4x3)}