Question

am nevoie de a,b,c si d va rooogggg

Answer 1

a) x = 51/17 = 3
b) 21x = 14 |:7  => 3x = 2  => x = 2/3
c) 2x = 12/8 - 3/8 = 9/8  => x = 9/16
d) x : (16/5) = x*(5/16) 
   (9/2):2,5 = (9/2):(25/10) = (9/2)*(10/25) = 9/5
 x*(5/16) = 9/5  => x = (9/5):(5/16) = (9/5)*16/5) = (9*16)/(5*5) = 144/25