分类：教育/科学-学习帮助
问题：你道数学题约分:1.(X+Y)Y/XY^2(注意:读法,X乘Y的 
约分: 
1. (X+Y)Y/XY^2 (注意:读法,X乘Y的平方分之X+Y的和乘Y) 
^→平方的意思 
2.X^2+XY/(X+Y)^2 

3.X^2-Y^2/(X-Y)^2 

通分: 
1. 2c/bd与3ac/4b^2 

2. 2xy/(x+y)^2与x/x^2-y^2 

请把过程写出来,懂哪题就答哪题
回答：约分: 
1. (X+Y)Y/XY^2=(x+y)/xy  

2.X^2+XY/(X+Y)^2 =(x*(x+y))/(x+y)^2=x/(x+y)

3.X^2-Y^2/(X-Y)^2 =(x+y)(x-y)/(x-y)^2=(x+y)/(x-y)

通分: 
1. 2c/bd=8bc/4b^d与3ac/4b^2=3acd/4b^2d 

2. 2xy/(x+y)^2=(2xy(x-y))/((x+y)^2(x-y))
x/x^2-y^2=(x(x+y))/((x+y)^2(x-y))