\(1,\\ a,=2x^3-10x^2-2x+2x^2-x\\ =2x^3-8x^2-3x\\ b,=-10x^4y^2z^2+35x^3y^2z^2+4x^4y^2z^2+4x^3y^2z^2\\ =-6x^4y^2z^2+39x^3y^2z^2\\ 2,\\ a,x^7+x^5+1\\ =x^7+x^6-x^6+x^5-x^5+x^5+x^4-x^4+x^3-x^3+x^2-x^2+x-x+1\\ =\left(x^7+x^6+x^5\right)-\left(x^6+x^5+x^4\right)+\left(x^5+x^4+x^3\right)-\left(x^3+x^2+x\right)+\left(x^2+x+1\right)\\ =\left(x^2+x+1\right)\left(x^5-x^4+x^3-x+1\right)\)