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daca a+b=3,4 si b+2c = 7,5 , calculati 3a + 4b + 2c​

Răspuns :

[tex]a+b=3.4 \implies 3a+3b=10.2\\b+2c=7.5\\\\3a+3b+b+2c=10.2+7.5\\\fbox{3a+4b+2c=17.7}[/tex]