a. 45 = 5.3² ; 60 = 2² . 3 . 5

ƯCLN(45,60) = 3 . 5 = 15

b. 48 = 2⁴ . 3 ; 72 = 2³ . 3² ; 90 = 2 . 5 . 3²

ƯCLN(48,72,90) = 2 . 3 = 6

c.132 = 2².3.11 ; 214 = 2.107;318 = 2 . 3 . 53

ƯCLN(132,214,318) = 2

d.210 = 2.5.3.7;420 = 2².5.3.7;980 = 2².5.7²

ƯCLN(210,420,980) = 2 . 5 . 7 = 70

a: UCLN(24;108)=12

b: UCLN(60;72)=12

c: UCLN(96;192)=96

d: UCLN(24;36;160)=4

\(a,24=2^3\cdot3;108=2^2\cdot3^3\\ \RightarrowƯCLN\left(24,108\right)=2^2\cdot3=12\\ b,60=2^2\cdot3\cdot5;72=2^3\cdot3^2\\ \RightarrowƯCLN\left(60,72\right)=2^2\cdot3=12\\ c,96=2^5\cdot3;192=2^6\cdot3\\ \RightarrowƯCLN\left(96,192\right)=2^5\cdot3=96\\ d,24=2^3\cdot3;36=2^2\cdot3^2;160=2^5\cdot5\\ \RightarrowƯCLN\left(24,36,160\right)=2^2=4\)

a,24=23⋅3;108=22⋅33⇒ƯCLN(24,108)=22⋅3=12b,60=22⋅3⋅5;72=23⋅32⇒ƯCLN(60,72)=22⋅3=12c,96=25⋅3;192=26⋅3⇒ƯCLN(96,192)=25⋅3=96d,24=23⋅3;36=22⋅32;160=25⋅5⇒ƯCLN(24,36,160)=22=4

Bấm tổ hợp phím: 

a) ALPHA  X   215   SHIFT   )   75   =

Kết quả: 5

b) ALPHA  :   45     SHIFT   )   72   =

Kết quả: 360

a, 

\(5\)

b, \(360\)

Ta có : 

\(1=1\)

\(16=2^4\)

\(\RightarrowƯCLN\left(1;16\right)=1\)

Ta có : 

⇒ ƯCLN (1; 16) = 1

b: BC(24;50)=B(600)

a: \(=-4\cdot\dfrac{2}{5}=-\dfrac{8}{5}\)

b: \(=3.6\cdot\dfrac{4}{3}=4.8\)

c: \(=72000\cdot\dfrac{3}{4}=54000\left(đồng\right)\)

Đáp án C