56x三次方yz 14x^2y^2减21xy^2的平方分解因式-搜答案-搜搜考试网

x三次方(x-2y)+y三次方(2x-y)=x³（x-2y)-y³(x-2y)=(x-2y)(x³-y³)=(x-2y)(x-y)(x²+xy+y&#

^表示乘方原式=5(x+y)³-2(x-y)^4-2(x+y)³+(y-x)^4=[5(x+y)³-2(x+y)³]+[-2(x-y)^4+(x-y)^4]=3

(x+y+z)^3-x^3-y^3-z^3=(x+y+z)^3-x^3-(y^3+z^3)=(x+y+z-x)[(x+y+z)^2+x(x+y+z)+x^2]-(y+z)(y^2-yz+z^2)=(y

-2xy-4x²y+8三次方y

原式=2xy(4x²-2x-1)再问：求过程再答：没有提取公因式

原式化简：(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)=2x^3-3x^2y-2xy^2-x^3+2xy^2-y^3-x^3+3x^2y-y^

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

（x+y）三次方×（2x+2y）三次方×（3x+3y）三次方=(x+y)³×8(x+y)³×27(x+y)³=216((x+y)的9次方

xy的三次方-2x²y²+x的三次方y=xy(y²-2xy+x²)=xy(x-y)²

原式＝(x-y)^4(x-y)(x-y)^3=(x-y)^4(x-y)^4=2(x-y)^4

上式化简的最终结果是-2y的平方,也就是与x无关,所以无论x取几,答案都一样为2

x²y³-2x(4xy³)=x²y³-2x²y³=-x²y³

a^3+b^3=(a+b)*(a^2-ab+b^2）.(a,b分别用X,Y代替吧,这是一个立方和公式)不过我感觉应该是最简了吧,如果用立方和来解开的话,计算步骤有会增多

y=(x-2)^3-x^3y'=3(x-2)^2-3x^2=12(1-x),y'(1)=0,驻点x=1y''=-12y(1)=-2是唯一的极值,是极大值,故也是最大值.

-8x四次方y+6x三次方y²-2x三次方y=-2x³y(4x-3y+1)

-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

这是两题还是一题?再问：两题再答：那就好第一题：-2x²y-x³-xy²原式=-x（2xy+x²+y²）=-x（x+y)²第二题：a

您好：x的三次方(y-x)的三次方-(x-y)的三次方=x的三次方(y-x)的三次方+(y-x)的三次方=（x³+1）(y-x)³=（x+1）（x²-x+1）(y-x)&

原式=(x-y)²[a²-2a(x-y)+(x-y)²]=(x-y)²[a-(x-y)]²=(x-y)²(2a-x+y)²