Bài 150 trang 59 SGK Toán 6 tập 1

Tìm BCNN của:

a) \(10, 12, 15\);                       

b) \(8, 9, 11\);                   

c) \(24, 40, 168\).

Lời giải

a) \(10 = 2 . 5\),

    \(12 = 2^2. 3\),

    \(15 = 3 . 5\).

\(BCNN (10, 12, 15) = 2^2. 3 . 5 = 60\);

b) \(8=2^3\)

    \(9=3^2\)

    \(11=11\)

\(BCNN (8, 9, 11) = 2^3 .3^2  . 11 = 792\);

c) \(24 = 2^3. 3\),

    \(40 = 2^3. 5\),

    \(168 = 2^3. 3 . 7\).

\(BCNN (24, 40, 168) = 2^3. 3 . 5 . 7 = 840\). 


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