a, 2x(2x-1)^2-3x(x+3)(x-3)-4x(x+1)^2
b, (a-b+c)^2-(b-c)^2+2ab-2ac
c, (3x+1)^2-2(3x+1)(3x+5)+(3x+5)^2
d, (2x+y)^2-(y-2x)^2
e, (3x+2)^2+2(2+3x)(1-2y)+(2y-1)^2
Loga
Sinh Học lớp 12
