Đáp án:
Giải thích các bước giải:
`x^3+x^2+x+1`
`=x^2(x+1)+(x+1)`
`=(x^2+1)(x+1)`
`x^2+4xy+4y^2+2x+4y+1`
`=x^2+2xy+x+2xy+4y^2+2y+x+2xy+1`
`=x(x+2y+1)+2y(x+2y+1)+(x+2xy+1)`
`=(x+2y+1)(x+2y+1)`
`=(x+2y+1)^2`
x³+x²+x+1=x²(x+1)+x+1=(x²+1)(x+1)
x²+4xy+4y²+2x+4y+1 hình như sai đề
mình nghĩ là như thế này x²+4xy+4y²+2x+4y=(x+2y)²+2(x+2y)=(x+2y)(2+x+2y)
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