Question

cho a = 45; b = 204; c = 126

A) tìm ƯCLN(a, b, c)

B) tìm BCNN(a, b ,c)

Answer 1

câu B) mik đánh thừa chữ c các bạn thông cảm nha

Answer 2

Ta có :

\(a=45=3^2.5\)

\(b=204=2^2.3.17\)

\(b=126=2.3^2.7\)

\(\RightarrowƯCLN\left(a;b;c\right)=ƯCLN\left(45;204;126\right)=3\)

\(\Rightarrow BCNN\left(a,b,c\right)=BCNN\left(45;204;126\right)=2^2.3^2.5.7.17=21420\)

Answer 3

a=45=3^2x5

b=2^2x3x17

c=126=2x3^2x7

A)ƯCLN(a,b,c)=3

B)BCNN(a,b)=2^2x3^2x5x17=3060

Answer 4

Ta thấy:

\(45=3^2.5\)

\(204=2^2.3.17\)

\(126=2.3^2.7\)

\(\Rightarrow\) ƯCLN (a,b,c) = ƯCLN ( 45;204;126 )=3

\(\Rightarrow\) BCNN (a;b;c) = BCNN ( 45;204;126 ) = \(2^2.3^2.5.7.17=21420\)

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