Đáp án:
$8. x( a + b - c )( x + 1 )$
$9. ( a + b )^{2n-1}( a + b + 1 )$
$10. 3( x + 1 )^{2}( y - 2x - 2 )$
Giải thích các bước giải:
$8. ( a + b - c )x^{2} - ( c - a - b )x$
$= ( a + b - c )x^{2} + ( a + b - c )x$
$= x( a + b - c )( x + 1 )$
$9. ( a + b )^{2n} + ( a + b )^{2n-1}$
$= ( a + b )^{2n-1}[ ( a + b ) + 1 ]$
$= ( a + b )^{2n-1}( a + b + 1 )$
$10. 3( x + 1 )^{n}y - 6( x + 1 )^{n+1}$
$= 3( x + 1 )^{n} . [ y - 2( x + 1 ) ]$
$= 3( x + 1 )^{2}( y - 2x - 2 )$
