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x3 - 11x2 + 30x = x(x2 - 11x + 30) = x(x2 - 6x - 5x + 30) = x[x(x - 6) - 5(x - 6)] = x(x - 5)(x - 6)
\(x^6-x^4-9x^3+9x^2\)
\(=x^6-x^5+x^5-x^4-9x^2\left(x-1\right)\)
\(=x^5\left(x-1\right)+x^4\left(x-1\right)-9x^2\left(x-1\right)\)
\(=\left(x-1\right)\left(x^5+x^4-9x^2\right)\)
\(x^6-x^4-9x^3+9x^2\)
\(=x^4.\left(x^2-1\right)-9x^2\left(x-1\right)\)
\(=x^4.\left(x-1\right)\left(x+1\right)-9x^2\left(x-1\right)\)
\(=\left(x-1\right)\left[x^4.\left(x+1\right)-9x^2\right]\)
a) \(2x-2y-x^2+2xy-y^2\)
\(=2\left(x-y\right)-\left(x^2-2xy+y^2\right)\)
\(=2\left(x-y\right)-\left(x-y\right)^2\)
\(=\left(x-y\right)\left(2-x+y\right)\)
b) \(9x^2+6xy+y^2-25\)
\(=\left(3x\right)^2+6xy+y^2-25\)
\(=\left(3x+y\right)^2-5^2\)
\(=\left(3x+y+5\right)\left(3x+y-5\right)\)
x6 - x4 - 9x3 + 9x2
= x4.(x2 - 1) - 9x2.(x - 1)
= x4.(x - 1).(x + 1) - 9x2.(x - 1)
= (x - 1).(x5 + x - 9x2)
= (x - 1).x.(x4 + 1 - 9x)
x^6-x^4-9x^3+9x^2
=x^2(x^4-x^2-9x+9)
=x^2[x^2(x^2-1)-9(x-1)]
=x^2[x^2(x-1)(x+1)-9(x-1)]
=x^2(x-1)[x^2(x+1)-9)]
=x^2(x-1)(x+1)(x^2-9)
=x^2(x-1)(x+1)(x-3)(x+3)
\(-\left(3x^2-5\right)^2\)
\(- ( 3 x2 - 5)2\)
Phân tích xong ròi nhá
MAGICPENCIL
HÃY LUÔN :-)