35Ds on high lord
15Ds on gores
20Ds on grief
20Ds on doom

.......................> 90Ds? or just 70 coz only 20% on weapons?

Read this quote, specifically the bolded part:
@ http://wiki.theamazonbasin.com/index.php/Deadly_Strike

So, from whichever is the attacking weapon.

hm then, 70% Deadly?? not 90%? my english is rly bad. thats why i dont understand if read big text ^^

or 70% with hitting weapon, and 50%with other?(if i haven't 20Deadly on other weap?)

Example:
non-weapon = 50

weapon 1 = 20

weapon 2 = 40

hit with weapon 1 = 70

hit with weapon 2 = 90

Sources of Deadly Strike stack except from a weapon which is not being used to inflict that particular blow (only applies to dual wield Assassin and Barbarians

According tot Diablo wiki

then, if i use GRIEF (20 DS) + Beast of Doom (20DS). with WW, how much DS i got? (with 35highord, 15gores) 90? or 70?

70 with grief and 70 with the beast. Stats like DS do not carry to your other weapon when dual wielding. Off-weapon DS affects both weapons.

This post was edited by TheBe on May 24 2013 09:54am

and if u se grief on main, and normal Beast on off? (0DL on offhand) 70+50?

Main or off-hand doesn't make a difference on how DS is added.