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a+b=18 b+c=20 calculeaza a+2×b+c c-a

Răspuns :

Kawaiimathask

a+b=18

=>a=18-b

b+c=20

=>c=20-b

a+2b+c=18-b+2b+20-b=38-2b+2b=38

c-a=20-b-(18-b)=20-b-18+b=2-b+b=2

Succes!

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