i) 2x 2 (x – 2)+ 3x(x 2 – x – 2) –5(3 – x 2 )
k) (x – 1)(x – 3) – (4 – x)(2x + 1) – 3x 2 + 2x – 5
l) (x 4 – x 3 – 3x 2 + x + 2) : (x 2 – 1)
Loga
Sinh Học lớp 12
