Biet rang : BCNN(a,b).UCLN(a,b)
a, BCNN cua hai so la 600, UCLN cua chung nho hon 10 lan BCNN. So thu 1 la 120, tim so thu 2.
b, UCLN cua hai so la 12, BCNN cua chung lon gap 6 lan UCLN . So t 1 la 24, tim so t 2
c, Tong cua hai so bang 60, tong giua UCLN va BCNN cua chung la 84. Tim hai so do.
tim 2 so tu nhien a va b biet rang BCNN;UCLN bang 15
tim hai so a va b biet a.b=2250va UCLN(a,b)=15
tin 2 so a va b biet rang a.b=1176;BCNN(a,b)=84 va a>b
biet rang BCNN(a,b).UCLN(a,b)=a.b
a, tong cua hai so bang 60,tong giua UCLN va BCNN cua chung la 84 tim hai so do
tim phan so a/b bang phan so 18/27 biet rang ucln(a,b)=13
tim phan so a/b bang phan so 18/27, biet rang ucln (a,b) 13
bang
tim 2 soAva B biet rang tong BCNN;UCLN bang 15
Tim 2 so a va b biet UCLN(a,b)=12;BCNN(a,b)=72
1 . Tìm 2 so tu nhien co tich bang 300 , ƯCLN bang 5
2 . Tim 2 so tu nhien a,b biet a + b = 66 , ƯCLN ( a , b ) = 6 . Trong do co 1 so chia het cho 5 .
3 . Tim cac so tu nhien a,b biet : UCLN(a,b) = 5 , BCNN(a , b) = 105
Chung minh : a x b = UCLN (a,b) x BCNN (a,b)
4 . Tim 2 so tu nhien a va b biet :
a x b = 360 ; BCNN ( a , b ) = 60
5 . Cho a va b la 2 so nguyen to cung nhau , chung minh rang cac so sau cung la 2 so nguyen to cung nhau :
a ; a va a +b b ; \(a^2\)va a + b c ; a x b va a + b
Giup minh lam cho xong nha , mot nop roi
