Question

afla numerele a,b si c stiind ca :
a+b=689
c-b=113
280+c=496

768 - a=b
a - c= 100
c - 132 = 231

a-b=252
b-c=624
c-55=45

Answer 1

280+c=496
c=496-280
c=216
280+216=496
c-b=113
216-b=113
b=216-113
b=103
a+b=689
a+103=689
a=689-103
a=586

Answer 2

1.
a+b=689
c-b=113
280+c=496
c=496-280;
c=216
216-b=113
b=216-113
b=103
a+103=689
a=689-103
a= 586

2.
768 - a=b
a - c= 100
c - 132 = 231;
c=231+132
c=363
a-363=100
a=100+363
a=436
768-436=b
b=332

3.
a-b=252
b-c=624
c-55=45
c=55+45
c=100
b-100=624
b=624+100
b=724
a-724=252
a=252+724
a=976