Toán Lớp 6: a)ƯCLN(56,140). b)ƯCLN(85,161) C)ƯCLN (66,84). d)ƯCLN(215,205) E) ƯCLN(26,39,48). F) ƯCLN (56,140)

Question

Toán Lớp 6:  a)ƯCLN(56,140).      b)ƯCLN(85,161)   C)ƯCLN (66,84).      d)ƯCLN(215,205) E) ƯCLN(26,39,48).      F) ƯCLN (56,140)

minhtuquynh · Answer

a)  ƯCLN (56,140)     56 = 2^3.   7     140 = 2^2. 5.7     Chọn: 2 v&agrave; 7 ; 2^2 v&agrave; 7^1     ƯCLN (54,140) = 2^2.7^1 = 4.7 = 28     b) ƯCLN(85,161)     85 = 5.17     161 = 7.23     ƯCLN(85,161) = 1     c) ƯCLN (66,84)     66 = 2. 3. 11     84 = 2^2. 3. 7     Chọn: 2 v&agrave; 3 ; 2^1 v&agrave; 3^1     ƯCLN (66,84) = 2^1. 3^1 = 2. 3 = 6     d) ƯCLN(215,205)     215 = 5.43     205 = 5.41     Chọn: 5 v&agrave; 5^1     ƯCLN(215,205) = 5     e) ƯCLN(26,39,48)     26 = 2.13     39 = 3.13     48 = 2^4.3     ƯCLN(26,39,48) = 1     f) ƯCLN (56,140)     56 = 2^3.7     140 = 2^2.5.7     Chọn: 2 v&agrave; 7 ; 2^2 v&agrave; 7^1     ƯCLN (56,140) = 2^2 . 7^1 = 4.7 = 28