1. Tim a,b thuoc so tu nhien
a. Bcnn(a,b) = 40; ucln =10
b. a - b = 48 , ucln = 12 va 10<a,b<100
c. a x b = 180, ucln = 6
d. ax b = 216, ucln = 6
e. a + b = 128, ucln = 16
2. tim ucln voi n thuoc so tu nhien (ghi cach trinh bay)
14n + 3 va 21n+ 4
tim a,b thuoc N biet BCNN(a,b)+UCLN(a,b)=14
tim a,b thuoc N biet BCNN(a,b)+UCLN(a,b)=14
tim A,B thuoc N bietAB=252va UCLN (A,B)=(2)
Tim a,b thuoc N* biet a+b = 24 va UCLN(a,b) =56
tim A,B thuoc N biet A.B =252va UCLN (A,B)=(2)
tim (a,b) thuoc n*biet;b ,a/b=4/5 va BCNN=140 ;; a+b=128 va UCLN =16
Cho B=9n-1/3n+2
a) tim n thuoc Z de B nhan gia tri nguyen
b)tim n thuoc z de B nhan gia tri lon nhat
Giup mk nhanh nhanh nha
tim a,b biet a+b=224 va UCLN(a,b)=56