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Ankaluk
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Calculati 1/5+2/10+3/15+4/20+...19/95+20/100

Răspuns :

1/5+2/10(o simplificam prin 2)+3/15(o simplificam prin 3)+4/20(o simplificam prin 4)+...19/95(cred ca se simplifica prin 19)+20/100(se simplifica prin 20)=1/5+1/5+1/5+1/5...+1/5+1/5(p.s. de aici nu mai stiu sa rezolv ....)
1/5+2/10+3/15+.....19/95+20/100=1/5+1/5+1/5+.....1/5=20/5=4