B1: tìm cách tập hợp sau rồi tìm bội chung của chung : A) BCNN ( 770,220) B) BCNN (154,220) C) BCNN ( 12,36) D) BCNN ( 28,56,560)

$\text{a/}$

$\text{Ta có: 770 = 2 . 5 . 7 . 11 ; 220 = }$$2^{2} . 5 . 11$ 

$\text{BCNN (770,220) = 1540}$

$\text{BC (770,220) = B(1540) = {0;1540;3080;...}}$

$\text{b/}$

$\text{Ta có: 154 = 2 . 7 .11 ; 220 = }$$2^{2} . 5 .11$

$\text{BCNN (154,220) = 1540}$

$\text{BC (154,220) = B(1540) = {0;1540;3080;...}}$

$\text{c/}$

$\text{Ta có: 12 = }$$2^{2} . 3 ; 36 = $ $2^{2} . $ $3^{2}$

$\text{BCNN (12,36) = 36}$

$\text{BC (12,26) = B(36) = {0;36;72;...}}$

$\text{d/}$

$\text{Ta có: 28 = }$$2^{2} . 7; 56 = $ $2^{3} . 7 ; 560 = $ $2^{4} . 5 . 7$

$\text{BCNN (28,56,560) = 560}$

$\text{BC (28,56,560) = B(560) = {0;560;1120;...}}$

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