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1//2+2/3+3/4+4/5+5/6+6/7=

Răspuns :

Răspuns

Raspuns  =  617/140

Explicație pas cu pas:

1/2+2/3+3/4+4/5+5/6+6/7=

(210+140*2+105*3+84*4+70*5+60*6)/420=

(210+280+315+336+350+360)/420=

1.851/420=617/140