Cộng các phân thức sau: x^2 + 2/ x^3 - 1 + 2/x^2 + x +1
Giải thích
x2+2x3−1+2x2+x+1+11−x=x2+2x−1x2+x+1+2x−1x−1x2+x+1−x2+x+1x−1x2+x+1=x2+2+2x−2−x2−x−1x−1x2+x+1=x−1x−1x2+x+1=1x2+x+1
x2+2x3−1+2x2+x+1+11−x=x2+2x−1x2+x+1+2x−1x−1x2+x+1−x2+x+1x−1x2+x+1=x2+2+2x−2−x2−x−1x−1x2+x+1=x−1x−1x2+x+1=1x2+x+1