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Semelhante a Adición y sustracción de fracciones (20)
Mais de María Pizarro (20)
Adición y sustracción de fracciones
- 4. 1 - 4x =
x–5 x–5
1 – 4x
=
x-5
- 5. Si t ≠ 1
t² 1 t² - 1
t–1
- t–1
=
t-1
=
(t + 1)(t – 1) = t+1
= t-1
Demre
- 7. 1 7 1•4 7•3 =
+ = + 8•3
6 8 6•4
MCM : 24
= 4 + 21 = 25
24 24 24
- 8. 1 7 1 7•a
a²
- a = a² - a•a =
MCM : a²
1 – 7a
= a²
- 9. m - m = m - m =
x 1 x
MCM : x
= m•x - m = mx – m =
m(x – 1)
1•x x x x
- 10. 7 3 7•2 3•m
5m² - =
10m 5m²•2
- 10m•m
10m² MCM
14 3m = 14 – 3m
10m²
- 10m² 10m²
- 11. 5 4
x² – 25
- x+5
(x + 5)(x – 5)
MCM = (x + 5)(x – 5)
- 12. 5 4 (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 3m
m² + 2m
+ m + 2
m(m + 2)
MCM = m(m +2)
- 15. 5 3m •m =
m(m + 2) + m + 2 •m
MCM m(m + 2)
= 5 + 3m²
m ( m + 2)
- 17. 5a + 4 •2
3a - 6 •2 - 2a – 6 •3
2a - 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 + 18 4a + 26
6(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+d Demre