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Stiind ca a+2b=60 si b+3d+2c=80, aflati valoarea sumei: S= 3a+11b+15d+10c+120. va rog ajutatima imi trebuie maine!!!!


Răspuns :

a+2b=60 *3⇔3a+6b=180
b+3d+2c=80 *5⇔5b+15d+10c=400
3a+6b+5b+15d+10c=180+400=580
S=3a+11b+15d+10c+120=580+120=700