class="bi x0 y0 w1 h1"
class="bi x0 y0 w2 h1"
class="bi x1 y0 w3 h1"
class="bi x1 y0 w4 h1"
class="bi x1 y0 w4 h1"
class="bi x1 y0 w5 h1"
class="bi x1 y0 w4 h1"
class="bi x1 y0 w5 h1"
class="bi x1 y0 w4 h1"
class="bi x1 y0 w4 h1"
class="bi x1 y0 w6 h1"
class="bi x1 y0 w4 h1"
class="bi x1 y0 w5 h1"
class="bi x1 y0 w4 h1"
class="bi x2 y0 w7 h1"
class="bi x1 y0 w4 h1"
class="bi x1 y0 w5 h1"
class="bi x1 y0 w4 h1"
class="bi x2 y0 w8 h1"
class="bi x1 y0 w4 h1"
class="bi x1 y0 w9 h1"
class="bi x1 y0 w4 h1"
class="bi x1 y0 w4 h1"
class="bi x2 y0 wa h1"
class="bi x2 y0 w7 h1"

Trích đoạn 20cm; 10cm B 10cm; 20cm C l5cm; 15cm D 22cm; 8cm. Cõu 40: Cho hai lũ xo giỗng nhau đều cú độ cứng là k Khi treo vậtm vào hệ hai lũ xo mắc

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