Rút gọn các biểu thức sau: 4x(x + 1) + (3 - 2x)(3 + 2x)

4x(x+1)+(3-2x)(3+2x)
(6x^3-7x^2-x+2):(2x+1)
(x-2)(x^2-5x+1)-x(x^2+11)
6xy(xy-y^2-8x^2(x-y^2)
(y^2+2)(y-4)-(2y^2+1)(1/2y-2)
5x(x-4y)-4y(y-5x)
5x(4x^2-2x+1)-2x(10x^2-5x-2)
(3x-5)(2x+11)-(2x+3)(3x+7)
(2b^2-2-5b+6b^3)(3+3b^2-b)