\(\frac{15}{x^2+5x}+\frac{6}{2x+10}=\frac{15}{x(x+5)}+\frac{6}{2(x+5)}=\frac{15.2}{x(x+5)}+\frac{6.x}{x(x+5)}=\frac{15.2+6.x}{x(x+5)}=\frac{30+6x}{x(x+5)}=\frac{6(x+5)}{x(x+5)}=\frac{6}{x}=\frac{3}{x}\)
5 Điểm