Question

Bài 1: Tìm :   a) UCLN( 42,30,20)        b) BCNN( 4,14,26)

      GIÚP MK VỚI

Answer 1

a) Ta có: \(42=21.2\)

\(30=2.3.5\)

\(20=2^2.5\)

\(\RightarrowƯCLN\left(42,30,20\right)=2\)

b) Ta có: \(4=2^2\)

\(14=2.7\)

\(26=2.13\)

\(\Rightarrow BCNN\left(4,14,26\right)=2^2.7.13=364\)

Answer 2

a: ƯCLN(42;30;20)=2

b: BCNN(4;14;26)=364

Answer 3

a) ƯCLN(42, 30, 20) = 2

b) BCNN(4, 14, 26) = 364

Answer 4

\(a,\)

\(42=2.3.7\)

\(30=2.3.5\)

\(20=2^2.5\)

\(\Rightarrow\)\(ƯCLN(42;30;20)=2\)

\(b,\)

\(4 = 2 ^2\)

\(14 = 2 ⋅ 7\)

\(26 = 2 ⋅ 13\)

\(\Rightarrow\)\(BCNN(4;14;26)=2 ^2 ⋅ 7 ⋅ 13 = 364\)

Answer 5

a: ƯCLN(42;30;20)=2

b: BCNN(4;14;26)=364