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suma a doua numere este 12.920,iar diferenta lor 12.900.care sunt numerele??

Răspuns :

a+b=12920
a-b=12900
a=12900+b
12900+b+b=12920
2b=12920-12900
2b=20
b=10
a=12900+10
a=12910
a+b=12920
a-b=12900 => a=b+12900

a |—|+12900|
b |—|

12920-12900=20
20:2=10 ( b )
10+12900=12910

Proba :
12910+10=12920
12910-10=12900