Toán Lớp 6: ƯC (16;60) (18;77) (18;90) (18;30;42) (26;39;48)

Question

Toán Lớp 6:  ƯC (16;60)        (18;77)        (18;90)        (18;30;42)         (26;39;48)

truongthanhhung · Answer

Ta c&oacute;:  16=2^4  60=2&sup2;.3.5  &rArr; ƯCLN(16,60)=2&sup2;=4  &rArr;ƯC (16,60)=Ư(4)={1;2;4}     Ta c&oacute;:  18=2.3&sup2;  77=7.11  &rArr; ƯCLN(18,77)=1  &rArr;ƯC (18,77)=Ư(1)={1}     Ta c&oacute;:  18=2.3&sup2;  30=2.3.5  42=2.4.7  &rArr; ƯCLN(18,30,42)=2  &rArr;ƯC (18,30,42)=Ư(2)={1;2}     Ta c&oacute;:  26=2.13  39=3.13  48=2^4 . 3  &rArr; ƯCLN(26;39;48)=1  &rArr;ƯC (26;39;48)=Ư(1)={1}

maitrucloan · Answer

ƯCLN(16, 60) = 2^2 = 4     &rarr; ƯC(16, 90) = {1; 2; 4}     ƯCLN(18, 77) = 1     &rarr; ƯC(18, 77) = {1}       ƯCLN(18, 90) = 2 . 3^2 = 18     &rarr; ƯC(18, 90) = {1: 3: 6: 18}     ƯCLN(18, 30, 42) = 2 . 3 = 6     &rarr; ƯC(18, 30, 42) = {1; 2; 3; 6}     ƯCLN(26, 39, 48) = 1     &rarr; ƯC(26, 39, 48) = {1}