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Calculați (1/2+3/4+5/6+7/8)x1 1/71

Răspuns :

 (1/2+3/4+5/6+7/8) ×1 1/71=
= (12×1+6×3+4×5+3×7)/24 ×72/71=
=
 (12+18+20+21)/24 ×72/71=
= 71/24 ×72/71=3