约分2x之xy²-搜答案-大师作文网

分子平方差公式：(2Y+x)(2y-x)分母十字相乘因式分（y+x)(2y-x)约分后为：（2y+x)/(y+x)=1+y/(x+y)

2xy（x-y）/（x-y）再答：的平方再答：结果就是2xy/（x-y）

过程如图

原式=[(x^2-2xy+y^2)-3^2]/[(x^2+6x+9)-y^2]=[(x-y)^2-3^2]/[(x+3)^2-y^2]=[(x-y+3)(x-y-3)]/[(x+3+y)(x+3-y)

吓到我了,开始还以为有x的2y次方呢,比我大学题还难~~先分子分母约去一个x（x^2-2xy）/(xy-2y^2)在提取公因式x(x-2y)/y(x-2y)约去x/y

xy+x/x的平方+2x+1=x(y+1)/(x+1)^2不能继续约分了题目如果是xy+y/x的平方+2x+1=y(x+1)/(x+1)^2=y/(x+1)

(（x-y）(x-y))/((x-y)(x+y))=(x-y)/(x+y).

这已经是最简了,没办法约分了,结果是（x+y)2分之（x+2y)(x-2y)

x四次方-y四次方/x平方-2xy+y平方=(x²+y²)(x+y)(x-y)/(x-y)²=(x²+y²)(x+y)/(x-y)

(x²+xy)/(x+y)²=x(x+y)/(x+y)²=x/(x+y)2xy/(x+y)²x/(x²-y²)∵最简公分母为：(x+y)&#

看你打字不容易,给你个答案=y(x-2)/(x-2)*(x-2)=y/(x-2)再问：谢谢你但我已经做出来了

(1)=x/y(2)=x/4

原式=(x+2)(x-2)/[y(x+2)=(x-2)/y

x³y-xy³/(x³-2x²y+y²x)=xy(x²-y²)/[x(x²-2xy+y²)]=xy(x+y)(

原式=xy(x+y)/[-xy(x²-y²)]=(x+y)/[-(x+y)(x-y)]=-1/(x-y)

2xy的平方分之3x的平方y=2y分之3x

约分 xy+2y/x2次方-4

y(x+2)/(x-2)(x+2)=y/(x-2)提取yx²-4=(x-2)(x+2)

=3x-4y/2x(4y-3x)提取公因式=-[3x-4y/2x(4y-3x)变好,使分子分母可约分=-2x/1

2xy/(x-y) (5+x)/(5-x)