Question

Wiedząc, że: a+b / b = 0,25 oblicz: 3a / a+b

Answer 1

(a + b) / b = 1/4

b = 4(a  +b)

b/4 = a+b

a + b = 1/4b

 

a = 1/4b - b

a = -3/4b

 

  3a          3 * (-3/4b)        -9/4b

------- = ------------------  =  -------- = -9/4 : 1/4 = -9/4 * 4/1 = - 9

a + b            1/4b                1/4b

Answer 2