\(a,ƯCLN\left(12,15\right)=3\\ b,ƯCLN\left(18,42\right)=6\\ c,ƯCLN\left(24,36,40\right)=2\\ d,ƯCLN\left(150,84,30\right)=6\\ e,BCNN\left(20,30\right)=60\\ f,BCNN\left(84,108\right)=756\\ g,BCNN\left(45,150\right)=450\\ h,BCNN\left(12,15,10\right)=60\)