Question

A.ưcln(147,168,189) B.ưcln(135,225,405) C.ưcln(128,192,320) D.ưcln (40,144) E.ưcln (42,70,84) F.ưcln (60,90,120) G.ưcln (240,180,210) H.ưcln (12,18) I.ưcln (45,60) J.ưcln (45,120,270)

Answer 1

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Answer 2

a: 147=3*7^2

168=2^3*3*7

189=3^3*7

=>ƯCLN(147;168;189)=3*7=21

b: 135=3^3*5

225=3^2*5^2

405=3^4*5

=>ƯCLN(135;225;405)=3^2*5=9*5=45

c: 128=2^7

192=2^6*3

320=2^6*5

=>ƯCLN(128;192;320)=2^6=64

d: 40=2^3*5

144=2^4*3^2

=>ƯCLN(144;40)=2^3=8

e: 42=2*3*7

70=2*5*7

84=2^2*3*7

=>ƯCLN(42;70;84)=2*7=14

f: 60=2^2*3*5

90=3^2*2*5

120=2^3*3*5

=>ƯCLN(60;90;120)=2*3*5=30

g: 240=2^4*3*5

180=2^2*3^2*5

210=2*3*5*7

=>ƯCLN(240;180;210)=2*3*5=30