3(x-1)的三次方y-(1-x)的立方z
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1、(x+y)乘(x-y)的三次方+(x+y)的三次方乘(y-x)=(x+y)(x-y)((x-y)²-(x+y)²)=(x+y)(x-y)(x-y+x+y)(x-y-x-y)=-
令2x平方加3x三次方加1为t,则y=cos三次方t令cost为a,则y=a的三次方.所以导数为3cos平方(2x平方加3x三次方加1)*{-sin(2x平方加3x三次方加1)}*(4x+9x的平方)
已知x=4/5,y=-1/5,求x三次方-y的三次方+3x平方y-3xy的平方x三次方-y的三次方+3x平方y-3xy的平方=(x-y)³=[4/5-(-1/5)]³=(4/5+1
x³y+2x²y²+xy³=xy(x²+2xy+y²)=xy(x+y)²=1×3²=9
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)²=1x²+y²+2xy=1xy=-1(x+y)^3=x^3+y^3+3x^2y+3xy^2=x^3+y^3+3xy(x+y)x^3+y^3=(x+y)^3-3
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
x+y=1则x^2+y^2+2xy=1因为x^2+y^2=3则xy=-1x^3+y^3=(x+y)(x^2-xy+y^2)=1*(3+1)=4
X+Y=1X³+Y³+3XY=(X+Y)(X²-XY+Y²)+3XY=X²-XY+Y²+3XY=X²+2XY+Y²=(X
-3(1/2x³-1/3y³+1/6)+2(1/3x³-1/2y³+1/4)=-3/2x³+y³-1/2+2/3x³-y³
因为绝对值和二次平方都不可能是负数,所以从第一句可以得知得数为0.所以:x-3=0y+1=0x=3y=-1即x3=27y3=-1
首先x3-y3=(x-y)(x2+xy+y2)其次x3-y3-3xy=1所以x3-y3=1+3xy=(x-y)(x2+xy+y2)x-y=(1+3xy)/(x2+xy+y2)=(1+3xy)/[(x-
x+y=1,平方,x^2+2xy+y^2=1,又x^2+y^2=3,所以xy=-2x^3+y^3=(x+y)(x^2-xy+y^2)=1*(3+2)=5
绝对值平方大于等于0所以此题只有0+0=0满足题意|x+2|=0;(y+1)²=0解得x=-2;y=-1-3(x-2y)³-2(2x-y)³=-3(0)³-2(
原式=(x+y)³×[2(x+y)]³×[3(x+y)]³=(1/2)³×1³×(3/2)³=1/8×27/8=27/64
A=x³+2x²y+2y³-1,B=3+y³-2x²y+2x³∵A+B+C=0∴C=-A-B=-x³-2x²y-2y
x三次方-3x²y+3xy²+4x²y-xy²+y的三次方=x三次方+2xy²+x²y+y的三次方当x=-1,y=-3时原式=-1-18-3
x^3-3x和y^3-3y都可以看成g(x)=x^3-3x对g(x)分析一下x=-1时极大值2x=1时极小值-2所以f(x,y)x=y=1时取极小值-3x=y=-1时取极大值5