(a-8)/12=(2a+5)/3
2006-10-30 13:29:06 · 9 respuestas · pregunta de Anonymous en Educación ➔ Ayuda con los Estudios
(a-8)/12 = (2a+5)/3
multiplicamos por 12:
a-8 = 8a + 20
reagrupamos:
7a = -28
despejamos a:
a = -28/7
a = -4
salu2
2006-10-30 13:33:01 · answer #1 · answered by achachm 2 · 1⤊ 0⤋
aplica propiedad de proporciones, "el producto de los medios es igual al producto de los extremos", asi:
(a-8)/12 = (2a+5)/3
(a-8) *3 = (2a+5)*12 donde "*" significa "por"
aplicando propiedad distributiva:
3a-24 = 24a+60
3a-24a = 60+24
-21a = 84
a = 84 / (-21)
a= - 4
Suerte!!!
2006-10-31 00:24:51 · answer #2 · answered by maryne 7 · 0⤊ 0⤋
a-8 = (2a+5)/3.12(simplificás)
a-8 = (2a+5).4
a-8 = 8a+20
a-8a=20+8
-7a = 28
a = 28 / -7
a = -4
2006-10-30 13:36:28 · answer #3 · answered by .•*¨)¸.ROsalinda ☼☼ 3 · 0⤊ 0⤋
A/B=C/D
= AC=BC
3(a-8)=12(2a+5)
termínala.
2006-10-30 13:35:43 · answer #4 · answered by mauricio 5 · 0⤊ 0⤋
(a - 8)/12 = 4(2a + 5)/12
a - 8 = 4(2a + 5)
a - 8 = 8a + 20
7a = - 28
a = - 28/7
a = - 4
2006-10-30 13:34:59 · answer #5 · answered by Anonymous · 0⤊ 0⤋
a - 8 = 8a + 20
-7a = 28
a = -4
2006-10-30 13:33:31 · answer #6 · answered by Goresco 2 · 0⤊ 0⤋
si yo se.....
Suerte!!!!
2006-10-30 13:36:08 · answer #7 · answered by Anonymous · 0⤊ 1⤋
si
a/12 -2a/3 = 8/12 +5/3 = 2/3 +5/3
(a-2a(4))/3= 7/3
asi que
-7a=7
por lo que
a=-1
2006-10-30 13:30:41 · answer #8 · answered by Anonymous · 0⤊ 2⤋
5 + 8 = 12
2006-10-30 13:30:34 · answer #9 · answered by Anonymous · 1⤊ 3⤋