Adición y sustracción de fracciones

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Adicin y sustraccin de fracciones

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  • 1. ADICIN YSUSTRACCIN DEFRACCIONESCon : nmeros, 2mmonomios y n-1polinomios.Mara Pizarro Aragons

2. IGUALDENOMINADOR: seconserva el denominador yse suman o restan losnumeradores. 3. 1 + 3 4 =5 5 5 4. 1 - 4x =x5 x51 4x= x-5 5. Si t 1 t1 t - 1t1- t1 = t-1=(t + 1)(t 1) = t+1= t-1 Demre 6. DISTINTODENOMINADOR: se busca el MCMentre losdenominadores. 7. 1714 73 =+ = + 836 8 64MCM : 24=4 + 21 = 25 24 2424 8. 17 17aa - a = a - aa =MCM : a1 7a= a 9. m - m = m - m=x 1 xMCM : x= mx - m = mx m=m(x 1)1x xxx 10. 7 3 72 3m5m -=10m 5m2- 10mm10m MCM 143m = 14 3m10m - 10m10m 11. 54 x 25 - x+5(x + 5)(x 5)MCM = (x + 5)(x 5) 12. 54 (x 5)(x + 5)(x 5) -(x + 5)(x 5)MCM = (x + 5)(x 5) 13. 5 - 4(x 5) 5 4x + 20 =(x + 5)(x 5)= (x + 5)(x 5)25 - 4x= (x + 5)(x 5) 14. m 3mm + 2m + m + 2m(m + 2)MCM = m(m +2) 15. 53mm=m(m + 2) + m + 2 mMCMm(m + 2)= 5 + 3mm ( m + 2) 16. DEMRE 17. 5a + 4 2 3a - 6 2 - 2a 6 32a - 4 3 =3(a 2) 2(a 2)MCM : 6 (a 2)2(5a + 4)- 3( 2a - 6)=6(a 2) = 18. 10a + 8 6a + 184a + 266(a 2) = 6(a 2) =2(2a + 13) 2a + 13 = 3 6( a 2) =3(a 2)Alternativa: A 19. S = ad + ab bd-1 S = bd = bd ad + ab a(b + d)d+b=b+dDemre 20. Primero se resuelve1 - 141 = 34= 4 4 4Despus 2 : 3 = 4=24 = 8 3 3 1 + 8 = 9 =3 3 3 3 21. FIN