Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(x\cdot\left(x+1\right)\cdot\left(x+2\right)\cdot\left(x+3\right)+1\)
\(=\left(x+1\right)\left(x+2\right)\left[x\left(x+3\right)\right]+1\)
\(=\left(x^2+x+2x+2\right)\left(x^2+3x\right)+1\)
\(=\left(x^2+3x+2\right)\left(x^2+3x\right)+1\)
gọi \(\left(x^2+3x\right)=a\)
\(\Rightarrow\left(t+2\right)t+1\)
\(=t^2+2t+1=\left(t+1\right)^2\)
\(\Rightarrow=\left(x^2+3x+1\right)^2\)
\(\Rightarrow x\cdot\left(x+1\right)\cdot\left(x+2\right)\cdot\left(x+3\right)+1\)\(=\left(x^2+3x+1\right)^2\)
\(1,12x^2y-27y^3=3y\left(4x^2-9y^2\right)=3y\left(2x+3y\right)\left(2x-3y\right)\\ 2,4x^2-36=4\left(x^2-9\right)=4\left(x-3\right)\left(x+3\right)\\ 3,x^2-4x+4-y^2=\left(x-2\right)^2-y^2=\left(x-y-2\right)\left(x+y-2\right)\\ 4,\left(3x+1\right)^2-\left(x-2\right)^2=\left(3x+1-x+2\right)\left(3x+1+x-2\right)=\left(2x+3\right)\left(4x-1\right)\)
\(1,=3y\left(4x^2-9y^2\right)=3y\left(2x+3y\right)\left(2x-3y\right)\)
\(2,=4\left(x^2-9\right)=4\left(x-3\right)\left(x+3\right)\)
\(3,=\left(x-2\right)^2-y^2=\left(x-y-2\right)\left(x-y+2\right)\)
\(4,=\left(3x+1-x+2\right)\left(3x+1+x-2\right)=\left(2x+3\right)\left(4x-1\right)\)
Đề sai nhé .Sửu lại
\(x^2-4x^2y^2+4+4x\)
\(=\left(x^2+4x+4\right)-4x^2y^2\)
\(=\left(x+2\right)^2-\left(2xy\right)^2\)
\(=\left(x+2+2xy\right)\left(x+2-2xy\right)\)