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Calculeaza atent urmarind modelele 1+3supra4=4supra4+3supra4=7supra4. 1+2supra3=? 3-5supra7=? 2+4supra5=? 1-1supra6=? 3-5supra6=18supra6-5supra6=13supra6 5+3supra4= 4-10supra8=