Question

Jika a = x(b+c), b = y(a+c), c = z(b+a)

temukan X + Y + Z
----------- ------------ -------------
1+x 1+y 1+z

Answer 1

X + y + z =b+c+a+c+b+a
x + y + z = 2a + 2b + 2c
1+x = 1+b+c
1+y=1+a+c
1+z=1+b+a