已知[-2X的三次方Y的两次方]的三次方*[-]
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/10 14:16:27
A-B=x³+2y³-xy²-(-y³+x³+2xy²)=x³+2y³-xy²+y³-x³
X³+Y³=(X+Y)(X²-XY+Y²)
(x+1)的二次方+(y-1)+z的绝对值=0所以x+1=0,y-1=0,z=0所以x=-1,y=1,z=0所以A=-2-0=-2B=1-0+0=1C=1+2-0=3原式=A-2B+C-3A=-2A-
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
(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
(x-y)^5/[(y-x)^3(y-x)^2]=(x-y)^5/[-(x-y)^3(x-y)^2]=(x-y)^5/[-(x-y)^5]=-1.
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
多项式+(-2)^3+4(x^2)y+5y^3=x^3-3(x^2)y+2y^3,即:多项式=x^3-3(x^2)y+2y^3-[(-2)^3+4(x^2)y+5y^3]=x^3-(x^2)y-3y^
负的(x-y)的10次方再问:为什么呢?我要过程麻烦你了再答:后面两个(y-x)可以提负号,二次的提出来是正的,三次的是负的。会了吧~
=(-2)³-(-2)²=-8-4=-12
(2x^4)y³-x³y^4=(x³y³)(2x-y)=(xy)³(2x-y)=4³×(1/16)=4
用导数解很容易的.(1)由f(x)=x³-ax²+2a,得f′(x)=3x²-2ax,当a=0时,f′(x)=3x²≥0恒成立,f(x)=x³在R上单
=xy(4x²+4xy+y²)=xy(2x+y)²
x³y-xy³=xy(x²-y²)=xy(x+y)(x-y)
y-2x=-20102x-y=20102x^4y³-x³y^4=x³y³(2x-y)=(xy)³(2x-y)=10³×2010=201000
x^3+x-y^3-y=(x^3-y^3)+(x-y)=(x-y)(x^2+xy+y^2)+(x-y)=(x-y)(x^2+xy+y^2+1).x^3-x^2-y^3+y^2=(x^3-y^3)-(x
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)&
y的三次方
=x^2+4xy+4y^2+y^2+6y+9=0(x+2y)^2+(y+3)^2=0x+2y=0,y+3=0x=6,y=-3x^2-y^2=6^2-(-3)^2=27