class="bi x0 y0 w2 h2"
class="bi x0 y0 w4 h4"
class="bi x0 y0 w2 h2"
class="bi x0 y0 w4 h4"
class="bi x0 y0 w6 h1"
class="bi x0 y0 w7 h5"
class="bi x0 y0 w4 h4"
class="bi x0 y0 w6 h1"
class="bi x0 y0 w6 h1"
class="bi x0 y0 w9 h7"
class="bi x0 y0 wb h8"
class="bi x0 y0 w9 h7"
class="bi x0 y0 w6 h1"
class="bi x0 y0 w6 h1"
class="bi x0 y0 w9 h7"
class="bi x0 y0 w2 h2"
class="bi x0 y0 w7 h5"
class="bi x0 y0 w2 h2"
class="bi x0 y0 w6 h1"
class="bi x0 y0 w2 h2"
class="bi x0 y0 w6 h1"
class="bi x0 y0 w7 h5"
class="bi x0 y0 w2 h2"
class="bi x0 y0 wc ha"

Trích đoạn P= (e;%eỞl;Z,Ởl) là một vectơ chỉ

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