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a = 1+2+...+20
b= 2+4+...+40:
va roggggggggggggggg repedeeeeeee​


Răspuns :

Sper ca te. am ajutat.

a= (20 . 21):2= 10 . 21= 210

b= (2+4+6+...+40)= 2(1+2+3+...+20)= 2 . (20.21):2= 20 . 21 = 420