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daca x+y=11,iar z=18 aflati 2x+2y+5z

Răspuns :

2(x+y)+5z=2·11+5·18=22+90=112
Daca x+y+11
2X+2y=2(x+y)=2*11=22
z=18
5z=5*18=90
Deci 
2x+2y+5z =22 +  90=112