Respuestas

2014-01-07T15:34:52+01:00
  • Usuario de Brainly
2014-01-07T16:00:11+01:00
1) a/b=c/d          a*d=b*c
   5/2=100/x      5*x=100*2        x=200/5    x=40

2)a/b=c/d  alternamos extremos  d/b=c/a
   5/2 =100/x              x/2 =100/5    5x=100*2    x=200/5 =40

3) alternamos medios
   a/b =c/d        a/c=b/d
   5/2=100/x
   5/100=2/x          5x = 100*2    x=200/5=40

4) permutamos
   a/b=c/d      c/d =a/b
   5/2 =100/x        100/x=5/2        100*2=5x        200/5 =x    40=x

5 )invertimos 
   a/b = c/d     b/a =d/c
5/2=100/x      2/5  =x/100    5x =100*2    x =200/5 =40

6) a/b =c/d    ( a+d)/a =(c+d)/c
   5/2 =100/x    (5+2)/5 =(100+x)100     7/5=(10+ x )/100
700/5 =100+x
700/5-100 =x
(700 -5000)/5 =x
200/5 =x
 40=x

7) a/b =c/d    ( a-b)/a =(c-d)/c
5/2=100/x
(5-2)/5 =(100-x)/100
3/5=(100-x)/100
300/5=100-x
300/5-100 =-x
(300-500)/5=-x
-200/5=-x
-40=-x
40 0 x

8) a/b = c/d     ( a+b)/(a-b)=(c+d)/c-d)
5/2 =100/x
(5+2)/(5-2) = (100+x)/(100-x)
7/3 =(100+x)/(100-x)
[ 7(100-x)]/3 =100+x
(700-7x)/3 =100+x
(700-7x)3 -100=x    saco mcd
(700-7x-300)/3=x
700-300-7x =3x
   400 =10x
     400/10=x
     10=x