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(7/4+7/8+7/12+...+7/100) : (1/4+1/8+1/12+...+1/100)

Răspuns :

7/4(1+1/2+1/3+............+1/25):1/4(1+1/2+1/3+...............+1/25)
se simplifica parantezele rotunde si rezulta: 7/4:1/4=7/4*4=7