Question

(7/8)^0-(5/7)^0+(4/9)^0

Answer 1

( 7/8)^0-(5/7)^0+(4/9)^0
= 1 - 1 + 1
= 2 - 1
= 1

because anything power 0 = 1

Answer 2

Anything power 0 = 1, except for 0 as 0 power anything is undefined,
Now (7/8)^0 = 1,
(5/7)^0 = 1,
(4/9)^0 = 1,

Now substitute, these values in the question,

=> 1-1+1,
=> 1,

Therefore the answer to your question is 1,

Hope you understand ,

Have a great day !!!