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có 14 con gà 90 con lợn con lợn = 6/1 con gà nếu con gà tăng thêm bao nhiêu để được con lợn
\(x^4+4\)
\(=\left(x^4+4x^2+4\right)-4x^2\)
\(=\left(x^2+2\right)^2-\left(2x\right)^2\)
\(=\left(x^2-2x+2\right)\left(x^2+2x+2\right)\)
\(=\left(x^4+x^3+2002x^2\right)-\left(x^3-x^2+2002x\right)+x^2+x+2002\)
\(=x^2\left(x^2+x+2002\right)-x\left(x^2+x+2002\right)+x^2+x+2002\)
\(=\left(x^2-x+1\right)\left(x^2+x+2002\right)\)
\(x^4+2002x^2-2001x+2002\)
\(=x^4+2002x^2+x-2002x+2002\)
\(=\left(x^4+x\right)+\left(2002x^2-2002x+2002\right)\)
\(=x\left(x^3+1\right)+2002\left(x^2-x+1\right)\)
\(=x\left(x+1\right)\left(x^2-x+1\right)+2002\left(x^2-x+1\right)\)
\(=\left(x^2-x+1\right)\left[x\left(x+1\right)+2002\right]\)
\(=\left(x^2-x+1\right)\left(x^2+x+2002\right)\)
\(a,=\left(5x^3+10x\right)+\left(x^4-4\right)\\ =5x\left(x^2+2\right)+\left(x^2+2\right)\left(x^2-2\right)\\ =\left(x^2+2\right)\left(x^2+5x-2\right)\\ b,=\left(x+y\right)^3-3xy\left(x+y\right)+z^3-3xyz\\ =\left[\left(x+y\right)^3+z^3\right]-3xy\left(x+y+z\right)\\ =\left(x+y+z\right)\left[\left(x+y\right)^2-z\left(x+y\right)+z^2\right]-3xy\left(x+y+z\right)\\ =\left(x+y+z\right)\left(x^2+2xy+y-xz-yz+z^2-3xy\right)\\ =\left(x+y+z\right)\left(x^2+y^2+z^2-xy-yz-zx\right)\)
\(c,=\left(x^8+x^7+x^6\right)-\left(x^7+x^6+x^5\right)+\left(x^5+x^4+x^3\right)-\left(x^4+x^3+x^2\right)+\left(x^2+x+1\right)\\ =\left(x^2+x+1\right)\left(x^6-x^5+x^3-x^2+1\right)\\ d,=\left(x^7+x^6+x^5\right)-\left(x^6+x^5+x^4\right)+\left(x^4+x^3+x^2\right)-\left(x^3+x^2+x\right)+\left(x^2+x+1\right)\\ =\left(x^2+x+1\right)\left(x^5-x^4+x^2-x+1\right)\\ e,=\left(x^{10}+x^9+x^8\right)-\left(x^9+x^8+x^7\right)+\left(x^7+x^6+x^5\right)-\left(x^6+x^5+x^4\right)+\left(x^5+x^4+x^3\right)-\left(x^3+x^2+x\right)+\left(x^2+x+1\right)\\ =\left(x^2+x+1\right)\left(x^{10}-x^7+x^5-x^4+x^3-x+1\right)\)
a: =x^4+2x^2+5x^3+10x-2x^2-4
=(x^2+2)(x^2+5x-2)
b; =(x+y)^3+z^3-3xy(x+y)-3xyz
=(x+y+z)*(x^2+2xy+y^2-xz-yz+z^2)-3xy(x+y+z)
=(x+y+z)(x^2+y^2+z^2-xy-yz-xz)
c: =x^8+x^7+x^6-x^7-x^6-x^5+x^5+x^4+x^3-x^4-x^3-x^2+x^2+x+1
=(x^2+x+1)(x^6-x^5+x^3-x^2+1)
câu ở dưới mình ghi sai đề
x4+2002x2+2001x+2002
mk đang cần gấp lắm.mọi người giúp mk nha.ai nhanh tay nhất mk k cho
\(x^4+2002x^2+2001x+2002\)
\(=x^4+x^3-x^3+x^2-x^2+2002x^2+2002x-x+2002\)
\(=\left(x^4+x^3+x^2\right)-\left(x^3+x^2+x\right)+\left(2002x^2+2002x+2002\right)\)
\(=x^2\left(x^2+x+1\right)-x\left(x^2+x+1\right)+2002\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+2002\right)\)
Ta có: \(x^4+2002x^2+2001x+2002\)
= \(x^4+2002x^2+2002x-x+2002\)
= \(\left(x^4-x\right)+2002\left(x^2+x+1\right)\)
= \(x\left(x^3-1\right)+2002\left(x^2+x+1\right)\)
= \(x\left(x-1\right)\left(x^2+x+1\right)+2002\left(x^2+x+1\right)\)
= \(\left(x^2+x+1\right)\left[x\left(x-1\right)+2002\right]\)
=\(\left(x^2+x+1\right)\left(x^2-x+2002\right)\)