tìm BCNN của :
a 5083 ; 11339 ; 2465 b 4301 ; 7956 ; 775
ai tra loi truoc minh se tick cho
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2431:11=221 5083:221= 23 => 5083/2431=5083:221/2431:221=23/11
2431:11=221
5083:221= 23
=> 5083/2431=5083:221/2431:221=23/11
5083=13.17.23
2465=5.17.29
11339=17.23.29
=>BCNN(5083,2465,11339) = 5.13.17.23.29=737 035
a: UCLN(48;72;240)=24
BCNN(18;24;30)=360
b: UCLN(24;36;160)=8
BCNN(24;36;160)=1440
BCNN cua (320,80) la 320
BCNN cua (10,33) la 330
BCNN cua (14,20,70) la 140
BCNN cua (42,28,132) la3696
`291/891=(97xx3)/(297xx3)=97/297`
`549/1281=(183xx3)/(183xx7)=3/7`
`3672/4284=(6xx612)/(7xx612)=6/7`
`7696/9970=(2xx3848)/(2xx4985)=3848/4985`
`578/3757=(2xx289)/(13xx289)=2/13`
`5083/2431=(23xx221)/(11xx221)=23/11`
\(\dfrac{291}{891}=\dfrac{97}{297};\dfrac{549}{1281}=\dfrac{3}{7}\\ \dfrac{3672}{4284}=\dfrac{6}{7};\dfrac{7976}{9970}=\dfrac{4}{5}\\ \dfrac{578}{3757}=\dfrac{2}{13};\dfrac{5083}{2431}=\dfrac{23}{11}\)
a, BCNN (5083,11339,2465 ) =6429156305
b, BCNN (4301,7956,775) = 1559972700
NHA
KB VS MK NHA