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(2+4+6+...+200):(4+8+12+....+400)

Răspuns :

Prima paranteză: 2(1+2+3+4+...100)= 2x[(100x101):2]=2x5050=10100 A doua paranteză: 4(1+2+3+...+100)= 4[(100x101):2]= 4x5050=20200 10100:20200=0.5