Question

14．找出這組數(shù)的最小公倍數(shù)
6和8．
4和18．

Answer 1

分析 兩數(shù)的最小公倍數(shù)，要看兩個數(shù)之間的關系：兩個數(shù)互質，則最小公倍數(shù)是這兩個數(shù)的乘積；兩個數(shù)為倍數(shù)關系，則最小公倍數(shù)為較大的數(shù)；兩個數(shù)有公約數(shù)的，最小公倍數(shù)是兩個數(shù)公有質因數(shù)與獨有質因數(shù)的連乘積；由此選擇情況解決問題．

解答 解：6=2×3
8=2×2×2
最小公倍數(shù)是2×2×2×3=24；
4=2×2
18=2×3×3
最小公倍數(shù)是2×2×3×3=36．

點評 此題主要考查求兩個數(shù)為倍數(shù)關系時兩個數(shù)的最小公倍數(shù)：兩個數(shù)為倍數(shù)關系，則最小公倍數(shù)為較大的數(shù)．兩個數(shù)互質，則最小公倍數(shù)是這兩個數(shù)的乘積．