Quy đồng mẫu các phân thức sau: x/(x^3+1); (x+1)/(x^2+x);(x+2)/(x^2-x+1)
Giải thích
MTC: x(x3+1)
xx3+1=x2x(x3+1)
x+1x2+x=x+1x(x+1)=1x=x3+1x(x3+1)
x+2x2−x+1=x(x+2)(x+1)x(x3+1)=x3+3x2+2xx(x3+1)
MTC: x(x3+1)
xx3+1=x2x(x3+1)
x+1x2+x=x+1x(x+1)=1x=x3+1x(x3+1)
x+2x2−x+1=x(x+2)(x+1)x(x3+1)=x3+3x2+2xx(x3+1)