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a+b=120     b+c=230   cerinte:a+2b+c=? si 5a+8b+3c=? stie careva??please!!!!!

Răspuns :

Dariutza09
a+b=120 b+c=230 a+2b+c=a+b+b+c=230+120=350 5a+8b+3c=5a+5b+3b+3c=5×(a+b)+3×(b+c)=5×120+3×230=600+690= 1290

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