x的平方+x分之3
=3(x+1)/x(x+1)²
x²+2x+1分之x+3
=(x+3)/(x+1)²
=x(x+3)/x(x+1)²能更详细吗x的平方+x分之3 =3/x(x+1) =3(x+1)/x(x+1)²x²+2x+1分之x+3 =(x+3)/(x+1)² =x(x+3)/x(x+1)² 祝学习进步，望采纳~~