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x3+x2-x+2=x3+2x2-x2-2x+x+2=(x3+2x2)-(x2+2x)+(x+2)=x2(x+2)-x(x+2)+(x+2)=(x+2)(x2-x+1)
\(x^3+x^2+x+1\)
\(=\left(x^3+x^2\right)+\left(x+1\right)\)
=\(x^2\left(x+1\right)+\left(x+1\right)\)=(x2+1)*(x+1)
Tích cho mình nhé,đúng đấy, không sai tí náo đâu
\(x^2-2x-4y^2-4y\)
\(=\left(x^2-4y^2\right)-\left(2x+4y\right)\)
\(=\left(x-2y\right)\left(x+2y\right)-2\left(x+2y\right)\)
\(=\left(x+2y\right)\left(x-2y-2\right)\)
\begin{array}{l} a){\left( {ab - 1} \right)^2} + {\left( {a + b} \right)^2}\\ = {a^2}{b^2} - 2ab + 1 + {a^2} + 2ab + {b^2}\\ = {a^2}{b^2} + 1 + {a^2} + {b^2}\\ = {a^2}\left( {{b^2} + 1} \right) + \left( {{b^2} + 1} \right)\\ = \left( {{a^2} + 1} \right)\left( {{b^2} + 1} \right)\\ c){x^3} - 4{x^2} + 12x - 27\\ = {x^3} - 27 + \left( { - 4{x^2} + 12x} \right)\\ = \left( {x - 3} \right)\left( {{x^2} + 3x + 9} \right) - 4x\left( {x - 3} \right)\\ = \left( {x - 3} \right)\left( {{x^2} + 3x + 9 - 4x} \right)\\ = \left( {x - 3} \right)\left( {{x^2} - x + 9} \right)\\ b){x^3} + 2{x^2} + 2x + 1\\ = {x^3} + 2{x^2} + x + x + 1\\ = x\left( {{x^2} + 2x + 1} \right) + \left( {x + 1} \right)\\ = x{\left( {x + 1} \right)^2} + \left( {x + 1} \right)\\ = \left( {x + 1} \right)\left( {x\left( {x + 1} \right) + 1} \right)\\ = \left( {x + 1} \right)\left( {{x^2} + x + 1} \right)\\ d){x^4} - 2{x^3} + 2x - 1\\ = {x^4} - 2{x^3} + {x^2} - {x^2} + 2x - 1\\ = {x^2}\left( {{x^2} - 2x + 1} \right) - \left( {{x^2} - 2x + 1} \right)\\ = \left( {{x^2} - 2x + 1} \right)\left( {{x^2} - 1} \right)\\ = {\left( {x - 1} \right)^2}\left( {x - 1} \right)\left( {x + 1} \right)\\ = {\left( {x - 1} \right)^3}\left( {x + 1} \right)\\ e){x^4} + 2{x^3} + 2{x^2} + 2x + 1\\ = {x^4} + 2{x^3} + {x^2} + {x^2} + 2x + 1\\ = {x^2}\left( {{x^2} + 2x + 1} \right) + \left( {{x^2} + 2x + 1} \right)\\ = \left( {{x^2} + 2x + 1} \right)\left( {{x^2} + 1} \right)\\ = {\left( {x + 1} \right)^2}\left( {{x^2} + 1} \right) \end{array} |
\(\left(x+y\right)^2-\left(x+y\right)\)
\(=\left(x+y\right)\left[x+y-1\right]\)
\(2\left(x+1\right)^2-3\left(x+1\right)\)
\(=\left(x+1\right)\left[2x+2-3\right]\)
\(=\left(x+1\right)\left[2x-1\right]\)
Lời giải:
$3(x^4+x^2+1)(x^2+x+1)^2$
$=3[(x^4+2x^2+1)-x^2](x^2+x+1)^2$
$=3[(x^2+1)^2-x^2](x^2+x+1)^2$
$=3(x^2+1-x)(x^2+1+x)(x^2+x+1)^2$
$=3(x^2-x+1)(x^2+x+1)^3$
\(x^3-x^2+x-1=\left(x^3-x^2\right)+\left(x-1\right)=x^2\left(x-1\right)+\left(x-1\right)=\left(x-1\right)\left(x^2+1\right)\)