Question

(2/15+1/12): 13/30- 1/7:1/2 va rog ajutatima

Answer 1

Răspuns:

Explicație pas cu pas:

( 2/15 + 1/12 ) : 13/30 - 1/7 : 1/2 = 3/14

->  c.m.m.m.c al numitorilor 15 si 12 este = 3 × 4 × 5 = 60

-> amplific fractia 2/15 cu 4 = (2×4)/(15×4) = 8/60

-> amplific fractia 1/12 cu 5 = (1×5)/(12×5) = 5/60

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= ( 8/60 + 5/60) : 13/30 - (1/7) × 2 =

= (13/60) × 30/13 - 2/7 =

= (13/13) × (30/60) - 2/7 =

= 1/2 - 2/7

-> c.m.m.m.c al numitorilor 2 si 7 este 14

-> amplific fractia 1/2 cu 7 = 7/14

-> amplific fractia 2/7 cu 2 = (2×2)/(7×2) = 4/14

= 7/14 - 4/14 =

= 3/14