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Calculeaza a b c din ex 1 si x,y,z din ex.2stiind ca a+b+c=900 a+b=393,b+c=518 .si x+y+z=802, x+y=486, y+z=398

Răspuns :

a+b+c=900
a+b=393
393+c=900
c=900-393=507
Si b+c=518
a+518=900
a=900-518=382
382+b=393
b=393-382=11


x+y+z=802
x+y=486
486+z=802
z=802-486=316
y+z=398
x+398=802
x=802-398=404
x+y=486
404+y=486
y=486-404=82