Question

bài 1 : cho a = 45  ; b=204 ; c=126 . tìm ƯCLN ( a,b,c) và BCNN (a,b,c)

Answer 1

45=3^2*5

204=2^3*3*17

126=2*3^2*7

=>ƯCLN(45;204;126)=3

BCNN(45;204;126)=3^3*5*2*17*7=80325

Answer 2

Ta có: 

\(a=45=3^2\cdot5\)

\(b=204=2^2\cdot3\cdot17\)

\(c=126=2\cdot3^2\cdot7\)

\(\RightarrowƯCLN\left(a,b,c\right)=3\)

\(\Rightarrow BCNN\left(a,b,c\right)=3^3\cdot5\cdot2\cdot17\cdot7=80325\)