Tìm ƯCLN (80;120)
Tìm BCNN (18;32)
Tìm BCNN (30;40)
Tìm BCNN (15;20)
Tìm ƯCLN (80;120) Tìm BCNN (18;32) Tìm BCNN (30;40) Tìm BCNN (15;20)
By Everleigh
By Everleigh
Tìm ƯCLN (80;120)
Tìm BCNN (18;32)
Tìm BCNN (30;40)
Tìm BCNN (15;20)
Tìm ƯCLN (80;120)
Ta có: 80= $2^{4}$ . 5
120= $2^{3}$ .3.5
=> ƯCLN (80,120)= 2³.5 = 40
Tìm BCNN(18,32)
Ta có: 18= 2.3²
32= $2^{5}$
=> BCNN(18, 32)=$2^{5}$ . $3^{2}$ = 288
Tìm BCNN (30;40)
Ta có: 30= 2.3.5
40= 2³.5
=> BCNN(30,40)= 2³.3.5= 240
Tìm BCNN (15;20)
Ta có: 15= 3.5
20= 2².5
=> BCNN(15,20)= 2².3.5= 60
CHÚC CHỦ TUS CUTE PHÔ MAI QUE HỌC TỐT NHA!!!!
a. Tìm `ƯCLN(80;120)`
`80=2^4*5`
`120=2^3*3*5`
`⇒ƯCLN(80;120)=2^3*5=40`
b. Tìm $BCNN(18;32)$
`18=2*3^2`
`32=2^5`
$⇒BCNN(18;32)=2^5*3^2=288$
c. Tìm $BCNN(30;40)$
`30=2*3*5`
`40=2^3*5`
$⇒BCNN(30;40)=2^3*3*5=120$
d. Tìm $BCNN(15;20)$
`15=3*5`
`20=2^2*5`
$⇒BCNN(15;20)=2^2*3*5=60$