Question

Suma a doua numere este 12.920,iar diferență lor ,12.900.Care sunt numerele? Repede va roggggg

Answer 1

a+b=12920
a-b=12900
___________
2a=25820=>a=12910
=>b=10

Answer 2

$a+b=12.920 \\ a-b=12.900 \to a=12.900+b \\ \\ 12.900+b+b=12.920 \\ 12.900+2b=12.920 \\ 2b=12.920-12.900 \\ 2b=20 \\ b=10 \\ \\ a=12.900+10 \\ a=12.910$