Rút gọn1) (2x+1)(x-3x)-6(x-2)^2+2(2x-1)^2+4x2) (2x+1)^3-(x+3)(x^2-3x+9)-3(x+2)(x^2-2x+4)3) (15-2x)(4x+1)-(13-4x)(2x-3)-(x-2)^24) (x^2-5x+1)+2(5x-1)(x^2-5x+1)+(5x-1)^2
Đăng ký qua Facebook hoặc Google: