Bài 1. Tìm ƯCLN rồi tìm tìm ước chung của các số sau: a) 540 và 163 b) 735 và 350
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\(a,ƯCLN\left(540,168\right)=12\\ \RightarrowƯC\left(540,168\right)=Ư\left(12\right)=\left\{-12;-6;-4;-3;-2;-1;1;2;3;4;6;12\right\}\\ b,ƯCLN\left(735,350\right)=35\\ \RightarrowƯC\left(735,350\right)=Ư\left(35\right)=\left\{-35;-7;-5;-1;1;5;7;35\right\}\)
a)225=32.52
270=2.5.33
360=23.32.5
=> ƯCLN 225;270;360=32.5=45
=>ƯC225;270;360=ước 45=1;3;5;9;15;45
b)540=22.33.5
756=33.22.7
1512=33.23.7
=>ưcln 540;756;1512=22.33=108
=>ưc 540;756;1512=ư 108=1;2;3;4;6;9;12;18;24;27;36;48;54;72;108
Bài 1 : \(a,36=2^2.3^2\)
\(b,105=357\)
Bài 2 : \(a,Ư\left(30,45\right)=\left\{1;3,5;15\right\}\)
\(b,Ư\left(42,70\right)=\left\{1;2,7;14\right\}\)
\(c,UCLN\left(40;70\right)=\left\{10\right\}\)
\(UCLN\left(55;77\right)=\left\{11\right\}\)
\(b,ƯCLN\left(70,540,1225\right)=35\\ \RightarrowƯC\left(70,540,1225\right)=Ư\left(35\right)=\left\{1;5;7;35\right\}\\ d,ƯCLN\left(48,24,60\right)=12\\ \RightarrowƯC\left(48,24,60\right)=Ư\left(12\right)=\left\{1;2;3;4;6;12\right\}\\ g,ƯCLN\left(3780,4320,5184\right)=108\\ \RightarrowƯC\left(3780,4320,5184\right)=Ư\left(108\right)=\left\{1;2;3;4;6;9;12;18;27;36;54;108\right\}\)
a: UCLN(24;40)=8
UC(24;40)={1;2;4;8}
b: UCLN(42;98)=14
UC(42;98)={1;2;7;14}
300 = 3. 10. 10 = 3 . 22. 52
375 = 3 . 53
UCLN ( 300 ; 375 ) = 3 . 52 = 75
=> UC ( 300 ; 375 ) = Ư ( 75 ) = { 1; 75; 3; 25; 5; 15}
a) Ta có : 225 = 32. 52
270 = 2 . 33 . 5
360 = 23. 32.5
→ ƯCLN= 32. 5 = 45
→ ƯC( 225,270,360)= Ư(45)
→ Ư(45) = \(\left\{1;3;5;9;15;45\right\}\)
Vậy ƯC( 225 ; 270; 360) =\(\left\{1;3;5;9;15;45\right\}\)
b) Ta có : 540 = 22. 33.5
756 = 22.33.7
1512 = 23. 33.7
→ ƯCLN( 540;756;1512)=22.33=108
→ƯC(540;756;1512)=Ư( 108)= \(\left\{1;2;3;4;6;9;12;18;27;36;54;108\right\}\)
Vậy ƯC( 540; 756;1512)= \(\left\{1;2;3;4;6;9;12;18;27;36;54;108\right\}\)
a, Ta có : 225 = \(3^2.5^2\)
270 = \(2.3^3.5\)
360 = \(2^3.3^2.5\)
ƯCLN\(_{\left(225,270,360\right)}\)= \(3^2.5=45\)
\(ƯC_{\left(225,270,360\right)}=Ư_{\left(45\right)}=\left\{1;3;5;9;15;45\right\}\)b, Ta có : 540 = \(2^2.3^3.5\)
756 = \(2^2.3^3.7\)
1512 = \(2^3.3^3.7\)
\(\RightarrowƯCLN_{\left(540,756,1512\right)}=2^2.3^3=108\)
\(ƯC_{\left(540,756,1512\right)}=Ư_{\left(108\right)}=\left\{1;2;3;4;6;9;12;18;108\right\}\)
a)
Ta có:
\(24=2^3.3\)
\(30=2.3.5\)
\(\RightarrowƯCLN\left(24;30\right)=2.3=6\)
\(\RightarrowƯC\left(24;30\right)=Ư\left(6\right)=\left\{1;2;3;6\right\}\)
b)
Ta có:
\(42=2.3.7\)
\(98=2.7^2\)
\(\RightarrowƯCLN\left(42;98\right)=2.7=14\)
\(\RightarrowƯC\left(42;98\right)=Ư\left(14\right)=\left\{1;2;7;14\right\}\)
c)
Ta có:
\(180=2^2.3^2.5\)
\(234=2.3^2.13\)
\(\RightarrowƯCLN\left(180;234\right)=2.3^2=18\)
\(\RightarrowƯC\left(180;234\right)=Ư\left(18\right)=\left\{1;2;3;6;9;18\right\}\)
a. ƯCLN(24;30) = 6
ƯC(24, 30) = {1; 2; 3; 6}
b. UCLN( 42 ; 98)= 14
ƯC(42;98) = \(\left\{1;2;7;14\right\}\)
c.UCLN( 180 ; 234 ) = 18
ƯC(180;234) = \(\left\{1;2;;6;9;18\right\}\)