C/m nếu a,b là các số nguyên dương thì left(left[a,bright]cright)left[left(a,cright),left(b,cright)right] left[left(a,bright),cright]left(left[a,cright],left[b,cright]right) left[a,b,cright]frac{abc.left(a,b,cright)}{left(a,bright),left(b,cright),left(c,aright)} left(a,b,cright)frac{abc.left[a,b,cright]}{left[a,bright],left[b,cright],left[c,aright]}
Đọc tiếp
C/m nếu a,b là các số nguyên dương thì
\(\left(\left[a,b\right]c\right)=\left[\left(a,c\right),\left(b,c\right)\right]\)
\(\left[\left(a,b\right),c\right]=\left(\left[a,c\right],\left[b,c\right]\right)\)
\(\left[a,b,c\right]=\frac{abc.\left(a,b,c\right)}{\left(a,b\right),\left(b,c\right),\left(c,a\right)}\)
\(\left(a,b,c\right)=\frac{abc.\left[a,b,c\right]}{\left[a,b\right],\left[b,c\right],\left[c,a\right]}\)