3y的三次方减12y的平方减9-搜答案-智慧作业帮

y=2x^3-3x^2y'=6x^2-6x=6x(x-1)x＜0,或x＞1时单调增,0＜x＜1时单调减极大值f(0)=0-0=0极小值f(1)=2-3=-1

5/12[-4/3(x-y)的三次方](x+y）的平方（-x-y）的三次方（y-x）的二次方＝(-5/9)×(x-y)³×(x+y)²×[-(x+y)³]×(x-y)&#

x^3-2x^2y^2+xy^3=x(x^2+2xy^2+y^3)很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选为满意回答】按钮,

多项式x的四次方-kx的三次方y+2x的平方y-3x的三次方y+y的四次方合并后不含x的三次方项所以-k-3=0所以k=-3如果不懂,祝学习愉快!

(x-y)^2-(x-y)^3=(x-y)^2*[1-(x-y)]=(x-y)^2(1-x+y)

6(x-y)^3+15(y-x)^2-9(y-x)^3=6(x-y)^3+15(x-y)^2+9(x-y)^3=15(x-y)^3+15(x-y)^2=15(x-y+1)(x-y)^2

x^3y-2x^2y^2+xy^3=x^3y+2x^2y^2+xy^3-4x^2y^2=xy(x^2+2xy+y^2)-4x^2y^2=xy(x+y)^2-4x^2y^2=12×7×7-4×12×12

6.联立a-b=30,b-c=25,两式相加,得a-c=55,a方-b方=1650可拆分成（a+c)(a-c)=1650,除以前面得出来的就是a+c=305.既然无意义,说明y-5为0,就是y为5,x

x²y-2x²y²+xy³=xy(x-2xy+y²)出题者估计是X的三次方y减2x的平方y的平方加xy的三次方x³y-2x²y&#

（-2x^2*y）^3(3xy^2)^2-12x^3*y^3(-5x^5*y^4)=-8x^6*y^3（3xy^2）^2+60x^8*y^7=-24x^8*y^7+60x^8*y^7=36x^8*y^

6(x-y)的三次方+12(x-y)的平方-3(y-x)的平方=6(x-y)³+12(x-y)²-3(x-y)²=6(x-y)³+9(x-y)²=3(

y的三次方-3y平方+y-2=y（y的平方-y-1）-2（y的平方-y-1）-4=-4

x-y=2两边同时平方又x^2+y^2=12所以xy=4原式=xy(x^2-2xy+y^2)=xy(x-y)^2=16

先分解因式,后乘法.(X^4-Y^4)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X+Y)(X^2+Y^2)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X^3+X^2Y+XY^2+

y=x³+3x²-1y′=3x²+6x当y′=0即3x²+6x=03x(x+2)=0x=0x=-2当x=0函数单调增当-2

-7x的三次方y的平方-21x的平方y的三次方=-7x²y²(x+3y)再问：求第二题再答：（x-y）的三次方-（y-x）的平方=（x-y）的三次方-（x-y）的平方=(x-y)&

a的三次方乘(x+y)的平方减4a的三次方c的平方=a^3[(x+y)^2-4c^2]=a^3(x+y+2c)(x+y-2c)

x³－3x²y＋3xy²－y³＝﹙x³－y³﹚－3xy﹙x－y﹚＝﹙x－y﹚﹙x²＋xy＋y³﹚－3xy﹙x－y﹚＝﹙x

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

x^2y-2x^2y^3-x^3y=x^2y(1-2y^2-x)