x y 的三次方-搜答案-智慧作业帮

-4x的三次方+xy²=x(y²-4x²)=x(y+x)(y-x)

已知x+y=1,则x^3+y^3+3xy=（x+y）(x^2-xy+y^2)+3xy=1×(x^2-xy+y^2)+3xy=x^2-xy+y^2+3xy=x^2+2xy+y^2=(x+y)^2=1^2

系数是-8次数是6次,因为一个单项式中,所有字母的指数的和叫做这个单项式的次数.

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

4x³-xy²=x(4x²-y²）=x(2x-y)(2x+y)

1/2（a+2b-3c)+5(2/3a-1/2b+2/3c)-3(a-2b+c)=1/2a+b-3/2c+10/3a-5/2b+10/3c-3a+6b-3c=(1/2+10/3-3)a+(1-5/2+

x²y³-2x(4xy³)=x²y³-2x²y³=-x²y³

=xy(4x²+4xy+y²)=xy(2x+y)²

4x的三次方y+4x²y²+xy的三次方=xy（4x²+4xy+y²）=xy（2x+y）²

9x的三次方-25xy的平方=x(9x²-25y²)=x(3x+5y)(3x-5y)

x³y-xy³=xy(x²-y²)=xy(x+y)(x-y)

xy(x+y)²-4x³y³=xy[(x+y)²-4x²y²]=xy(x+y+2xy)(x+y-2xy)

x³+y³-1+3xy=(x+y)(x²-xy+y²)+3xy-1=(x+y)[(x+y)²-3xy]+3xy-1=(x+y)³-3xy(x

(-xy)的五次方除以(-xy)的三次方=(-xy)的5-3次方=(-xy)²=x²y²再问：不好意思，是（-xy）的五次方除以（-xy）的二次方再答：=-x³

-(xy)²,把(-1)³先提出来,算完再乘上去

z=x^3+y^3+3xy∂z/∂x=3x^2+3y∂^2z/∂x^2=6x=A∂z/∂y=3y^2+3x∂^2z/

4x³-xy²=x(4x²-y²)=x[(2x)²-y²]=x(2x+y)(2x-y)

(3xy)³+(xy)³=27x³y³+x³y³=28x³y³很高兴为您解答,【the1990】团队为您答题.请点击下面

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

原式=(-4)*(-2)*(x*x²)y³=8x³y³