Question

( a x 1 - a : 1 ) x ( a x 26 )

Answer 1

( a x 1 - a : 1 ) x ( a x 26 )

= 0 x ( a x 26 )

= 0

Answer 2

( a . 1 - a: 1 ) . (a . 26 )

=( a - a ) . ( a . 26 )

= o - ( a . 26 )

=0

Nhớ k cho mình nha ! " . " nghia la nhân