a, 3x² – 7x² b, 2x (x-3) + 5 (x-3)
a, 3x² – 7x² b, 2x (x-3) + 5 (x-3)
Câu hỏi mới
$=x.(3x-7)$
$b,2x.(x-3)+5.(x-3)$
$=(2x+5)(x-3)$