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?2x?1?x. ?
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??2x?1?x?1?x?8?4x?1
??2(x?5)?6(x?1)??3(x?1)?5x?1x?1?7?5x ??33
?x?2?1??x?1??1 ?1?2?2x?4 * *
?x??2x?21?x?2??x?1 ??2?2x?3?5?2x?1??1 ??3x?2?43?x?1??
??4x?3?x?x?4?2x?1
. ??2x?1?5?3x?1? ?2?1?x
??2x?5?4(x?2)?x?1?2x ??3
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