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ex 13 va rog repede!!!!

Ex 13 Va Rog Repede class=

Răspuns :

C+P=D
P-180=C=>P=C+180
C+P=800
C+C+180=800
2C+180=800=>2C=620=>C=310
310+P=800=>P=800-310=490
310+490=D ===>D=800
310+490=800===>