xy+y^2分之1,x^2+2xy+y^2分之1求通分!快啊,
问题描述:
xy+y^2分之1,x^2+2xy+y^2分之1求通分!快啊,
答
xy+y²=y(x+y) ,x²+2xy+y²=(x+y)² 最简公分母是y(x+y)²
1/(xy+y)=(x+y)/[ y(x+y)²]
1/(x²+2xy+y²)=y/[ y(x+y)²]