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daca x+y=11 iar z=8 cat face 2x+2y+5z??

Răspuns :

2x + 2y + 5z = 2( x+y) + 5z = 2 x 11 + 5 x 8 = 22 + 40 = 62 
2x + 2y + 5 z = 2 ( x + y ) + 5z = 2 x 11 + 5 x 8 = 22 + 40 = 62