Question

afla numerele a b si c stiind ca a+b=c a-b=b b+c=32

Answer 1

c=a+b
b=a-b
b+c=32

a+b+a-b=32 => a+a=32 => a=16

b=16-b => b+b=16 => b=8

c=a+b => c=16+8 => c=24

Answer 2

a+b=c
a-b=b
b+c=32

adunam primele doua ecuatii astfel a+b+a-b=c+b => 2a=c+b cum b+c=32 => 2a=32 => a=32:2=16
adunam a doua cu a treia ecuatie astfel a-b+b+c=b+32 => 16+c=b+32 +> c-b=32-16=16
Scadem primele doua ecuatii astfel a+b-a+b=c-b => 2b=c-b=16 => b=8
deci a+b=c => 16+8=c => c=24