c) x+1/ x^2 -5x + x - 18/ x^2 -5x +x +2/ x^2 -5x;
Giải thích
c) x+1x2−5x+x−18x2−5x+x+2x2−5x
=x+1+x−18+x+2x2−5x
=(x+x+x)+(1−18+2)x(x−5)
=3x−15x(x−5)=3(x−5)x(x−5)=3x;
c) x+1x2−5x+x−18x2−5x+x+2x2−5x
=x+1+x−18+x+2x2−5x
=(x+x+x)+(1−18+2)x(x−5)
=3x−15x(x−5)=3(x−5)x(x−5)=3x;