Răspunsuri

2014-06-04T12:48:05+03:00
7s/9=?
unde s=a+b+c

c-b=b-a
b=279

c-b-b+a=0
c-2b+a=0
c-2*279+a=0
c-558+a=0
c+a=558
a+b+c=558+279
s=837

7*837/9=
5859/9=
651
3 3 3
2014-06-04T12:56:24+03:00
D = diferenta dintre numere

x  = 279 - d
y  = 279
z  = 279 + d
x + y + z   279 - d + 279 + 279 + d       -d  cu +d se reduc

x + y + z = 279 + 279 + 279 = 837 (suma celor 3 numere)

7 / 9   din 837 = 7 * 837 / 9 = 7 * 93 = 651



2 3 2