Vì ƯCLN(a;b) . BCNN(a;b) = a.b
=> 10 . 400 =a . b
a . b =4000
a.b = UCLN(a,b).BCNN(a,b) suy ra a.b=10.400=4000 vay a.b = 4000 , tick nha
Vì UCLN(a;b) x BCNN(a;b)=a.b
\(\Rightarrow\)10 x 400 = a.b
\(\Rightarrow\) a.b=4000
ƯCLN(a, b) . BCNN(a; b) = a . b
10 . 400 = a . b
4000 = a . b