Question

hey guys pls help me with this.
can you pls tell me how did x ^3 , y ^3 and z ^3 come in the end step​

Answer 1

if you take the LCM of the denominator

you will get x, y, z

in order to get x, y, z you should also multiply

the numerators then you will get all the 3 cubes in the numerator

Answer 2

Answer:

LCM of the three fraction is XYZ,

first fraction = z²/xy => to make its denominator xyz, you have to multiply both Nr and Dr with z,

=> z²/xy × z/z = z³/xyz

similarly with 2nd fraction x²/yz × x/x => x³/xyz

and 3rd fraction y²/zx × y/y => y³/xyz

now as you have common denominator xyz,

sum of the three fraction becomes

(z³+x³+y³) / xyz