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2+4+6+...+abc (cu bara deasupra) = abc00 (cu bara deasupra)
Aflati abc cu bara deasupra.


Răspuns :

2+4+6+...+abc=abc00

2[1+2+3+...+(abc:2)]=100×abc

2×(abc:2)(abc:2+1):2=100×abc

abc:2×(abc:2+1)=100×abc

abc×(abc:2+1)=100×2×abc

abc×(abc:2+1)=200×abc

abc:2+1=200×abc:abc

abc:2+1=200

abc:2=200-1

abc:2=199

abc=199×2

abc=398

...............
Sper ca am ajutat
Sa ai o zi frumoasa :)