OK thanks 
i tried playing the measure that you mention and i understand how it's sound different.
i will practice it at the complete piece.
the impotent thing for me from this post is that the way of using pedal in specific piece isn't definite.
i also want to know if there is recommend sequence for learning piece.
what i mean its that so far i was practicing
right hand and left hand separately,
after that i was practice left hand+pedal.
finally i was practice together right+left+pedal.
the reason i ask it that if i for example get used to using pedal only by playing the left hand
there can be dissonant(problems...you name it) in specific place when the right hand will add. but when i will know it, i already accustomed to using the pedal in this way. hope i was clear.
Everything in a score is open to at least a limited amount of interpretation because of how vague our musical terms are.
If a composer puts P, or they put F, how can we truely know the exact volume of sound they were suggesting. We have to take the piece as a whole and try to understand the composers intentions as best possible. We can also do research on composers to further understand their play style, for Example, everyone knows Chopin had a very delicate and almost feeble touch, and so what he puts as P could be PP for another composer.
The same applies to pedal, the composer is indicating that Pedal be applied to achieve the sound they had intended, but where exactly is up to your ability to listen to how it sounds.
Regarding your learning strategy, honestly there are 1000 different ways you can learn a piece that works and maybe 10 ways that you can lean that works personally for you.
For me I go a couple bars at a time, almost a phrase, hands together, pedal and where possible dynamics, but I will focus more as I develop my knowledge of the whole piece. Some love going through the whole piece one hand then another, some like learning the notes with no pedalling at all, practice different ways and see what works for you.