Bài 1: Thực hiện phép tính
a) 2x^2–5x.(x+1)+3.(x–1).(x+1)
b) 4.(x-1).(x+5)-(x+2).(x+5)-3.(x-1).(x+2)
c) 2.(x-2).(x+2)+(8-5x).(x+4)+4.(x-2).(x+1)+10
d) (2b^2-2-6b^3-5b).(3+3b^2-b)
e) (2ab+2a^2+b^2).(2ab^2+4a^3-4a^2b)
f) (6a^2-12-3a^3).(4a-4a^4+2a^7)
g)...