Question

answer the question please with explanation​

Answer 1

Step-by-step explanation:

a/(b+c)=b/(c+a)=c/(a+b)=k

a=k(b+c)

b=k(c+a)

c==k(a+b)

a+b+c=2k(a+b+c)

(a+b+c)(1-2k)=0

1-2k=0

k=1/2

b)

x+4/x+12 =x-1/x+5

(x+4)(x+5)=(x+12)(x-1)

x^2+9x+20=x^2+11x-12

9x+20=11x-12

2x=32

x=16

Answer 2

Answer:

Step-by-step explanation:

3) -1/2

4) 16