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daca x+y=8 si y+2z=35calculati a)5x+13y+16z ;b)3y-2x+10z va rog repede

Răspuns :

5X+13Y+16Z=5X+5Y+8Y+16Z=5(X+Y)+8(Y+2Z)=5x8+8x35=8(5+35)=8x40= 320