Toán Lớp 6: Bài 3.Hãy tìm a)BC (8,18,28) BCNN b);BC (8,19) BCNN c);BC (24,72,216) BCNN VOTE 5*

Question

Toán Lớp 6:  Bài 3.Hãy tìm  a)BC (8,18,28) BCNN b);BC (8,19) BCNN c);BC (24,72,216) BCNN VOTE 5*

dongoclandiem · Answer

B&agrave;i 3 :          a) Ta c&oacute;: 8=2&sup3;         18=2x3&sup2;         28=2&sup2;x7         =>BCNN(8,18,28)=2&sup3;x3&sup2;x7=504         b)BCNN(8,19)=1         c)Ta c&oacute;: 24 = 2&sup3;x3         72=2&sup3;x3&sup2;         216=2&sup3;x3&sup3;         =>BCNN(24,72,126)=2&sup3;x3&sup3;=216         $#nguyenhai121210$

dananhnhu2k4 · Answer

a:ta c&oacute;     8=2&sup3;   18=2.3&sup2;      28=2^4.7     BCNN(8,18,28)=2^4.3&sup2;.7=1008     BC(8,18,28)=B(1008)={0;1008;2016;....}     b:  Hai số 8 v&agrave; 19 nguy&ecirc;n tố c&ugrave;ng nhau n&ecirc;n     BCNN(8,19)=8.19=152     BC(8,19)=B(152)={0;152;304;456;...}     c:  V&igrave; 216 chia hết cho 24 v&agrave; 72 n&ecirc;n BCNN(216,24,72)=216     BC(216,24,72)=B(216)={0;216;432;648;864;.....}