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calculati:5(a+c)+2b,daca a+2b=44 si 7a+6b+5c=200

Răspuns :

a+2b= 44
7a+6b+5c = 200
adunam cele 2 ecuatii
8a+8b+5c = 244
5(a+c)+3(a+2b)+2b = 244
5(a+c)+3×44+2b = 244
5(a+c)+132+2b = 244
5(a+c)+2b = 244-132
5(a+c)+2b = 112