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a: \(x^4+x^2+2x+6\)
\(=x^4-2x^3+3x^2+2x^3-4x^2+6x+2x^2-4x+6\)
\(=\left(x^2-2x+3\right)\left(x^2+2x+2\right)\)
a) \(x^3+9x^2+27x+27=\left(x+3\right)^3\)
b) \(3\sqrt{3x^3}+18x^2+12\sqrt{3x}+8=\left(\sqrt{3x}+2\right)^3\)
c) \(\dfrac{1}{4}-x^2=\left(\dfrac{1}{2}-x\right)\left(\dfrac{1}{2}+x\right)\)
\(x^8+3x^4+4\)
\(=\left(x^8-x^6+2x^4\right)+\left(x^6-x^4+2x^2\right)+\left(2x^4-2x^2+4\right)\)
\(=x^4\left(x^4-x^2+2\right)+x^2\left(x^4-x^2+2\right)+2\left(x^4-x^2+2\right)\)
\(=\left(x^4+x^2+2\right)\left(x^4-x^2+2\right)\)
\(4x^4+4x^3+5x^2+2x+1\)
\(=\left(4x^4+2x^3+2x^2\right)+\left(2x^3+x^2+x\right)+\left(2x^2+x+1\right)\)
\(=2x^2\left(2x^2+x+1\right)+x\left(2x^2+x+1\right)+\left(2x^2+x+1\right)\)
\(=\left(2x^2+x+1\right)^2\)
\(x^8+3x^4+4\)
\(=x^8+4x^4+4-x^4\)
\(=\left(x^4-2\right)^2-x^4\)
\(=\left(x^4-x^2-2\right)\left(x^4-x^2-2x^2-2\right)\)
\(=\left(x^2-2\right)\left(x^2+1\right)\left(x^2-1\right)\left(x^2+2\right)\)
\(=\left(x-1\right)\left(x+1\right)\left(x^2-2\right)\left(x^2+1\right)\left(x^2+2\right)\)
1: \(-x^2+2x+8\)
\(=-\left(x^2-2x-8\right)\)
\(=-\left(x-4\right)\left(x+2\right)\)
2: \(2x^2-3x+1=\left(x-1\right)\left(2x-1\right)\)
câu hỏi hay......nhưng tui xin nhường cho các bn khác
Hãy tích đúng cho tui nha
THANKS
\(x^8+3x^4+1\)
\(=\left(x^4\right)^2+2x^4.\frac{3}{2}+\left(\frac{3}{2}\right)^2-\frac{5}{4}\)
\(=\left(x^4+\frac{3}{2}\right)^2-\left(\sqrt{\frac{5}{4}}\right)^2\)
\(=\left(x^4+\frac{3}{2}-\sqrt{\frac{5}{4}}\right)\left(x^4+\frac{3}{2}+\sqrt{\frac{5}{4}}\right)\)
Nhận lời thách đố
\(=x^8+\frac{6}{2}x^4+1\)
\(=x^8+\frac{3+\sqrt{5}+3-\sqrt{5}}{2}x^4+\frac{\left(3+\sqrt{5}\right)\left(3-\sqrt{5}\right)}{4}\)
\(=x^8+\frac{x^4.\left(3+\sqrt{5}\right)}{2}+\frac{x^4\left(3-\sqrt{5}\right)}{2}+\left(\frac{3+\sqrt{5}}{2}\right)\left(\frac{3-\sqrt{5}}{2}\right)\)
\(=x^4\left(x^4+\frac{3+\sqrt{5}}{2}\right)+\frac{3-\sqrt{5}}{2}\left(x^4+\frac{3+\sqrt{5}}{2}\right)\)
\(=\left(x^4+\frac{3-\sqrt{5}}{2}\right)\left(x^4+\frac{3+\sqrt{5}}{2}\right)\)
Nếu thấy đúng nhớ tk nha