b, Ta có:
24 = $2^{3}$ × 3
84 = $2^{2}$ × 3 × 7
180 = $2^{2}$ × $3^{2}$ × 5
⇒ Ư CLN(24, 84, 180) = $2^{2}$ x 3 = 12
Ư C(24, 84, 180) = {±1; ±3; ±6; ±12}
c, Ta có:
18 = 2 x $3^{2}$
40 = $2^{3}$ x 5
88 = $2^{3}$ x 11
⇒ Ư CLN(18, 40, 88) = 2
Ư C(18, 40 88) = {±1; ±2}
e, Ta có:
18 = 2 x $3^{2}$
30 = 2 x 3 x 5
77 = 7 x 11
⇒ Ư CLN(18, 30, 77) = {±1}
ƯC(18; 30; 77) = 1
d, Ta có:
60 = $2^{2}$ x 3 x 5
90 = 2 x $3^{2}$ x 5
135 = $3^{3}$ x 5
⇒ Ư CLN(60, 90, 135) = 3 x 5 = 15
ƯC(60, 90 , 135) = {±1; ±3; ±5; ± 15}
a, Ta có:
14 = 2 x 7
44 = $2^{2}$ x 11
180 = $2^{2}$ x $3^{2}$ x 5
⇒ Ư CLN(14, 44, 180) = 2
ƯC(14, 44, 180) = {±1; ±2}
b, Ta có:
26 = 2 x 13
86 = 2 x 43
178 = 2 x 89
⇒ Ư CLN(26, 86, 178) = 2
ƯC(26, 86, 178) = {±1; ±2}
c, Ta có:
28 = $2^{2}$ x 7
48 = $2^{4}$ x 3
84 = $2^{2}$ x 3 x 7
⇒ Ư CLN(28, 48, 84) = $2^{2}$ = 4
ƯC(28, 48, 84) = {±1; ±2; ±4}
d, Ta có:
30 = 2 x 3 x 5
70 = 2 x 5 x 7
130 = 2 x 5 x 13
⇒ Ư CLN(30, 70, 130) = 2 x 5 = 10
ƯC(30, 70, 130) = {±1; ±2; ±5; ±10}
a, Ta có:
18 = 2 x $3^{2}$
30 = 2 x 3 x 5
42 = 2 x 3 x 7
⇒ Ư CLN(18, 30, 42) = 2 x 3 = 6
ƯC(18, 30, 42) = {±1; ±2; ±3; ±6}
b, Ta có:
5661 = $3^{2}$ x 17 x 37
5291 = 11 x 13 x 37
4292 = $2^{2}$ x 29 x 37
⇒ Ư CLN(5661; 5291; 4292) = 37
ƯC(5661, 5291, 4292) = {±1; ±37}
