6xy平方-9x平方y-y三次方 (2a-b)平方 8ab-搜答案-智慧作业帮

＝（9x＾7y＾8－27x＾7y＾8）÷9x＾7y＾8＝－18x＾7y＾8÷9x＾7y＾8＝－2

X的平方-6xy+9y的平方=(x-3y)²

3x(x^2-2)y^2+6xy^2+9x^2y^2再问：O(∩_∩)O谢谢再答：原式=3x^3-6x^2y+3xy^2提取公因式，得3x(x^2-2xy+y^2)由完全平方公式，得3x(x-y)^2

-3x³+6x²y-3xy²=-3x（x²-2xy+y²）=-3x（x-y）²

=(6x³y²-18x²y³+27x^6y³)/(3x²y²)=6x³y²/(3x²y²)

x³y³—2x²y²+xy=xy(x²y²-2xy+1)=xy[(xy)²-2xy+1]=xy(xy-1)²

-6x²y-3x³-3xy²=-3x(2xy+x²+y²)=-3x(x+y)²

10分给你把答案做出来就得10分钟

x^3y-xy=xy(x^2-1)=xy(x-1)(x+1)-x^3+2x^2-x=-x(x^2-2x+1)=-x(x-1)^22x^2+2y^2-4xy=2(x^2-2xy+y^2)=2(x-y)^

原式=-y(9x²-6xy+y²)=-y(3x-y)²

2x三次+x分之1-4x四次方=(1+2x²)(1-2x²)/[x(2x²+1)]=(1-2x²)/xy-x平方y分之x平方y-2xy+y=y(x-1)

原式=x^3+2x^2y+xy^2 =x(x^2+2xy+y^2) =x(x+y)^2再问：x-2��֮x-

a³-4a=a(a²-4)=a(a+2)(a-2)x³-2x²y+xy²=x(x²-2xy+y²)=x(x-y)²-x&

（x的三次方+3x的平方y-5xy的平方+6y三次方+1003）-（2x的三次方-y的三次方-2xy的平方-x的平方y-2）-(4x的平方y+7y的三次方-x的三次方-3xy的平方-1007）(x^3

6xy²+9x²y+y³=y(9x²+6xy+y²)=y(3x+y)²

-x三次方y-2x平方y平方-xy三次方=-xy(x²+2xy+y²)=-xy(x+y)²

x³y-2x²y+xy=xy(x²-2x+1)=xy(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-

=x(x-3y)²/y(x+3y)(x-3y)=x(x-3y)/y(x+3y)

x³-y³-x²y+xy²=(x³-y³)-(x²y-xy²)=(x-y)(x²+xy+y²)-xy