Bài 1:
a) \(400=2^4.5^2\)
b) \(600=2^3.3.5^2\)
c) \(126=2.3^2.7\)
d) \(198=2.3^2.11\)
Bài 2:
\(45=3^2.5\)
\(204=2^2.3.17\)
\(126=2.3^2.7\)
ƯCLN(45;204;126;)=3
\(BCNN\left(45;204;126\right)=3^2.5.2^2.17.7=21420\)
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B1:a)400=24.52
b)600=23.3.52
c)53
d)198=2.32.11
B2)45=32.5
204=22.3.17
126=2.32.7
UCLN(45;204;126)=3
BCNN(45;204;126)=32.22.5.7.17=21420
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