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Cel mai inteligent răspuns!
2014-10-02T14:23:05+03:00

20m-pm+20n-pn-15=
20m-20n-pm-pn-15=
20(m+n)-p(m+n)-15=
aici inlocium si obtinem
20·23-15·23+15=115
2014-10-02T14:24:51+03:00
M+n=23,p=15
20m-pm+20n-pn-15=20(m+n)-p(m+n)-15=20x23-15x23-15=23(20-15)-15=23x5-15=115-15=100
marcheaza-l daca e cel mai bun raspuns.multumesc!