a: ƯCLN(40;24)=8

ƯC(40;24)=Ư(8)={1;2;4;8}

b: UCLN(80;144)=16

UCLN(80;144)={1;2;4;8;16}

c: UCLN(9;18;72)=9

ƯC(9;18;72)={1;3;9}

d: ƯCLN(25;55;75)=5

ƯC(25;55;75)={1;5}

\(a,40=2^3.5\\ 24=2^3.3\\ \Rightarrow UCLN_{\left(24;40\right)}=2^3=8\\ \RightarrowƯC_{\left(40;24\right)}=Ư_{\left(8\right)}=\left\{1;2;4;8\right\}\\ b,80=2^4.5\\ 144=2^4.3^2\\ \Rightarrow UCLN_{\left(80;144\right)}=2^4=16\\ \RightarrowƯC_{\left(80;144\right)}=Ư_{\left(16\right)}=\left\{1;2;4;8;16\right\}\\ c,9=3^2\\ 18=2.3^2\\ 72=3^2.2^3\\ \Rightarrow UCLN_{\left(8;18;72\right)}=3^2=9\\ \RightarrowƯC_{\left(9;18;72\right)}=Ư_{\left(9\right)}=\left\{1;3;9\right\}\\ d,25=5^2\\ 55=5.11\\ 75=5^2.3\\ \Rightarrow UCLN_{\left(25;55;75\right)}=5\\ \RightarrowƯC_{\left(25;55;75\right)}=Ư_{\left(5\right)}=\left\{1;5\right\}\)

a) Ta có :

65 = 5 . 13

125 = 5^3

ƯCLN (65,125) = 5

ƯC ( 65,125 ) = Ư(5) = { 1; 5 }

b, Ta có:

34 = 2 . 17

72 = 2³ . 3²

132 = 2² . 3 . 11

=> ƯCLN (34; 72; 132) = 2

=> ƯC (34; 72; 132) = Ư(2) = {\(\pm\)1; \(\pm\)2}

b, Ta có:

9 = 3²

18 = 2 . 3²

72 = 2³ . 3²

=> ƯCLN (9; 18; 72) = 3² = 9

=> ƯC (9; 18; 72) = Ư(9) = {\(\pm\)1; \(\pm\)3; \(\pm\)9}

34 = 2. 17 

72 = 2. 31 

132 = 2² . 3 . 11 

UCLN ( 34; 72 ; 132 ) = 2 

ƯC(34; 72 ; 132 ) = Ư(2) = { 1; 2 } 

a)9,18:0,2+9,18:0,25+9,18

=9,18x(0,2+0,25+1)

=13,311

b)9,18:0,2-6,18-0,2

=(9,18-6,18):0,2

=15

c)2,4:0,125+2,4:0,25-2,4:0,5

=2,4:(0,125+0,25-0,5)

=24

kink cho minh nhe

Banj có thể giải thích giúp là tại sao 

2,4÷0,125 + 2,4 ÷0,25 - 2,4 ÷ 0,5 

2,4÷(0,125 + 0,25 - 0,5)

= 24

9.18x(75.2+24.8)

=9.18x100

=918

9,18 x 75,2 + 24,8 x 9,18 = 9,18 x ( 75,2 + 24,8) =918

9,18 x 75,2 + 24,8 x 9,18=9,18x(75,2+24,8)

=9,18x100=918

(-9,18) : 4,25 = - 2,16

2x+4.72=9.18

2x          =9.18-4.72

2x          =4.46

  x          =4.46:2

 x           =2.23

 ^...^  ^_^

\(2x+4.72=9.18\)

\(2x=9.18-4.72\)

\(2x=4.46\)

\(x=4.46:2\)

\(x=2.23\)

Vậy \(x=2.23\)

2x+4,72=9,18

=>2x=9,18-4,72

=>2x=4,56

=>x=4,56:2

=>x=2,28

x + 4,72 = 9,18

x = 9,18 – 4,72

x = 4,46

\(-9,18\div4,25\)

\(=-2,16\)

       [ Hoq chắc ]

bấm máy tinh ra : -2,16

\(-9,18 : 4,25=-2,16.\)

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