Răspuns :
×+12.590=34.473
×=34.473-12.590
x=21.883
40.910-y=13.715
y=40.910-13.715
y=17.195
z-12.734=58.266
z=58.266+12.734
z=71.000
×=34.473-12.590
x=21.883
40.910-y=13.715
y=40.910-13.715
y=17.195
z-12.734=58.266
z=58.266+12.734
z=71.000