This type problem has simple rule to solve, ie BDMAS rule, did you know what is it?

Bracket

Division

Multiplication

Addition

Subtraction

Now try to solve answer should be like this way,

1+1-1+1x0

Here is no Bracket, Division,next priority goes to Multiplication

So, 1+1-1+'1x0'

1+1-1+0

Next priority goes to Addition

So, '1+1'-'1+0'

ie,2-1=1

Hence the answer is "one and only 1".

If you are not following this BDMAS rule, you get different answer based on the priority you give. So here we can see lot of answers.