phân tích đa thức thành nhân tử
3x(x 1)^2-5x^2(x 1) 7(x 1)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(3x^2\left(x-1\right)+5x\left(1-x\right)^2\\ =-3x^2\left(1-x\right)+5x\left(1-x\right)\left(1-x\right)\\ =\left(1-x\right)\left(-3x^2+5x-5x^2\right)\\ =x\left(1-x\right)\left(-3x+5-5x\right)\\ =x\left(1-x\right)\left(5-8x\right)\)
\(3\left(x-y\right)^2+9y\left(y-x\right)^2\\ =3\left(x-y\right)\left(x-y\right)+9y\left(y-x\right)\left(y-x\right)\\ =-3\left(x-y\right)\left(y-x\right)+9y\left(y-x\right)\left(y-x\right)\\ =\left(y-x\right)\left(-3x+3y+9y^2-9xy\right)\\ =\left(y-x\right)\left[-3\left(x-y\right)+9y\left(y-x\right)\right]\\ =\left(y-x\right)\left[-3\left(x-y\right)-9y\left(x-y\right)\right]\\ =\left(y-x\right)\left(-3-9y\right)\left(x-y\right)\\ =-3\left(y-x\right)\left(1+3y\right)\left(x-y\right)\)
\(3x\left(x+1\right)^2-5x^2\left(x+1\right)+7\left(x+1\right)\)
\(=\left(x+1\right)\left(3x^2+3x-5x^2+7\right)\)
\(=\left(x+1\right)\left(-2x^2+3x+7\right)\)
\(=3x\cdot\left(x-5y\right)+2y\cdot\left(x-5y\right)\)
\(=\left(x-5y\right)\left(3x+2y\right)\)
\(3x\left(x-5y\right)-2y\left(5y-x\right)\)
\(=3x\left(x-5y\right)+2y\left(x-5y\right)\)
\(=\left(x-5y\right)\left(3x+2y\right)\)
\(3x-3y+a\left(x-y\right)=\left(x-y\right)\left(a+3\right)\)
\(4x\left(x+1\right)^2-5x^2\left(x+1\right)-4\left(x+1\right) =\left(x+1\right)\left[4x\left(x+1\right)-5x^2-4\right]=\left(x+1\right)\left(4x^2+4x-5x^2-4\right)=\left(x+1\right)\left(-x^2+4x-4\right)=-\left(x+1\right)\left(x-2\right)^2\)
\(4x\left(x+1\right)^2-5x^2\left(x+1\right)-4\left(x+1\right)\)
\(=4x\left(x^2+2x+1\right)-5x^2\left(x+1\right)-4\left(x+1\right)\)
\(=4x^3+8x^2+4x-5x^3-5x-4x-4\)
\(=-x^3+8x^2-5x-4\)
bạn có thể ghi rõ lại được ko ạ, bạn có thể thay dấu nhân bằng dấu chấm
Ta có: \(3x\left(x-1\right)^2-5x^2\left(x-1\right)-7\left(x-1\right)\)
\(=\left(x-1\right)\left[3x\left(x-1\right)-5x^2-7\right]\)
\(=\left(x-1\right)\left(3x^2-3x-5x^2-7\right)\)
\(=\left(x-1\right)\left(-2x^2-3x-7\right)\)