36(x y)平方-49(x-y)平方-搜答案-拍题作业网

(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)=(x+y)(x-y)/(x+y)+(x-y)^2/(x-y)=x-y+x-y=2(x-y)

x平方+3xy+2y平方/x平方y+2xy平方=（x+2y）（x+y）/x(x+2y)=(x+y)/x在我回答的右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.

y/(x²-xy)+2/(y-x)-x/(y²-xy)=[y²+2(-xy)+x²]/(x²y-xy²)=(x-y)²/[(x-y

(3xy)平方/(-xy)+(x-2y)平方-(x+2y)(x-2y)=-9xy+(x-2y)(x-2y-x-2y)=-9xy+(x-2y)(-4y)=-9xy-4xy+8y²=8y

(3x平方-4y平方)+[-(x平方-2xy-y平方)]-[(3x平方-2xy-y平方)]=3x²-4y²-x²+2xy+y²-3x²+2xy+y&#

=(xy-x的平方）除以(x的平方-2xy+y的平方\xy)乘以(x-y\x的平方)=-x（x-y）×xy/（x-y）2×（x-y）/x2=-y再问：嗯

xy(x-y)-x(x-y)平方=(x-y)[xy-x(x-y)]=(x-y)[2xy-x^2]=(x-y)*x(2x-y)-a平方+1.9b平方=(b根号1.9+a)(b根号1.9-a)-12xy+

x平方+y平方+2xy分之x平方-4y平方除以x平方+xy分之2y+x=(x-2y)(x+2y)/(x+y)²·x(x+y)/(x+2y)=x(x-2y)/(x+y)

x的平方-2xy/xy-2y的平方＝x(x-2y)/y(x-2y)=x/y

原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)

=x^3-y^3-(x^3+y^3)=-2y^3^3表示三次方

x^3+y^3=(x+y)(x^2-xy+y^2)x^3-y^3=(x-y)(x^2+xy+y^2)

x²y(x-y)-xy²(x-y)=xy(x-y)(x-y)=xy(x-y)²如果不懂,祝学习愉快!

x^2y-xy^2+x^3-y^3=x^2y-y^3+x^3-xy^2=y(x^2-y^2)+x(x^2-y^2)=(x+y)(x^2-y^2)=(x+y)^2(x-y)不懂还可以问(⊙o⊙)哦再问：

=(x+y)(x+y)(x^2-xy+y^2)(x^2-xy+y^2)=(x^3+y^3)^2

xy+y平方+x-y-2=xy+x+y^2-y-2=x(y+1)+(y+1)(y-2)=(y+1)(x+y-2)

X²-XY-6Y²+2X-Y+1=(X+1)²-Y(X+1)-6Y²=(X+1-3Y)(X+1+2Y)再问：学生不才老师您第一步我就不知道怎么得到的再答：X2-

2x平方y-2xy+3xy平方+5+2xy+x平方y-3xy平方-3=2x²y-2xy+3xy²+5+2xy+x²y-3xy²-3=3x²y+2

(x平方+2xy+y的平方）/（x+y)=（x+y)²/(x+y)=x+y