1.
a,x(5x-3)-x^2(x-1)+x(x^2-6x)-10+3x=5x^2-3x-x^3+x^2+x^3-6x^2-10+3x=-10
b) x(x^2+x+1)-x^2(x+1)-x+5=x^3+x^2+x-x^3-x^2-x+5=5
2.
a, x^4+2x^3+x^2=x^2(x^2+2x+1)=x^2(x+1)^2
b,c xem lại đề
d) x^2+4x+3=x^2+x+3x+3=x(x+1)+3(x+1)=(x+1)(x+3)
e, 16x-5x2-3=x-5x^2+15x-3=x(1-5x)-3(1-5x)=(x-3)(1-5x)
f...