calculeazax+y+z+k stiind ca y=144:x k=72:z y:z=k kori5=45

Răspuns :

k=45:5=9
9=72:z => z=8
y:8=9 => y=9•8=72
72=144:x => x=144:72=2

x+y+z+k=2+72+8+9=91