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suma a doua nr.este 12920,iar dif.lor12900.care sunt nr

Răspuns :

Spidie
a+b=12920  +
a-b=12900
_________
2a +0 =25820
2a=25820  /: 2
a=12910

b=12920 - a
b=12920 - 12910
b=10
p+t=12920; p-t=12900; 2p=25820; p=12910; t=12920-12910=10

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