作业帮y=x²-2x 3化成y=a
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x=log2(y)则X1+2X2+3X3=log2(y1)+2log2(y2)+3log2(y3)=log2(y1)+log2(y2^2)+log2(y3^3)=log2(y1y2^2y3^3)=1所
y'=-3x^2+3=0,得极值点x=1,-1f(1)=2+a为极大值,f(-1)=-2+a为极小值有两个实根,则其中必有一个为重根,相当于极大值或极小值与X轴相切.且极大值需为非负,极小值为非正.f
y=-1/3x^2+2x+3=(-1/3)*(x²-6x)+3=(-1/3)*(x²-6x+9-9)+3=(-1/3)*[(x-3)²-9]+3=(-1/3)*[(x-3
设圆的标准方程为(X-a)^2+(y-b)^2=1.（1）上式展开后得：X^2-2ax+a^2+y^2+2by+b^2=1与原方程比较后可得：-2a=-1-2b=1即a=1/2b=-1/2a^=1/4
x3次方y-2x2y2+xy3=xy(x²-2xy+y²)=xy（x-y）²=3x3²=27如果本题有什么不明白可以追问,再问：=xy(x2-2xy+y2)=x
(x+y)³=x³+y³+3x²y+3xy².记忆方法：各立方,然后3x方y,3xy方(x+y)³=x³-y³-3x&#
(1)y=x^2+2x+5=x^2+2x+1+4=(x+1)^2+4(2)y=4x^2+8x=4(x^2+2x)=4(x^2+2x+1)-4=4(x+1)^2-4
y=1/4X^2+X-1=1/4(x^2+4x+4-4)-1=1/4(x+2)^2-2
y=1/4(x^2+4x)-1=1/4(x^2+4x+4)-1-1=1/4(x+2)^2-2
2再答：y=(x-1)²+2再答：y=x²-2x-1+2=(x-1)²+2
y=a(x+h)²+k=a(x²+2hx+h²)+k··················（配方法）=ax²+2ahx+ah²+k令a=1/32ah=2
1.曲线C1:y=x3(x≥0)与曲线C2：y=-2x3+3x(x≥0)交于O、A联立方程组得y=x3y=-2x3+3x解得x=0,x=1则O、A坐标为(0,0)(1,1)直线x=t(0
1、1)y=x²-3x+1=(x²-3x+9/4)+1-9/4=(x-3/2)²-5/42)y=1/2x²-x+1=1/2(x²-2x+1)+1-1/
将y=ax+b代入y=x3-ax2-bx，消去a，b，得：y=x3-xy，于是（x+1）y=x3，若x+1=0，即x=-1，则上式左边为0，右边为-1不可能，所以x+1≠0，于是y=x3x+1=x2-
两边同除以x^2y'/(x^2)-(2/x^3)y=x通分(xy'-2y)/(x^3)=x[y/(x^2)]'=x积分y/(x^2)=(1/2)x^2+Cy=(1/2)x^4+Cx^2再问：请问，最终
y=3(x²+2x/3)=3(x²+2x/3+1/9-1/9)=3(x²+2x/3+1/9)-1/3=3(x+1/3)²-1/3所以开口向上对称轴是x=-1/3
A-B=(x3+2y3-xy2)-(﹣y3+x3+2xy2)=x³+2y³-xy²+y³-x³-2xy²=3y³-3xy²
y=2x^2-4x-1=2(x-1)^2-3
y=x³-6x²+12x-8-x³=-6x²+12x-8=-6(x-1)²-2所以x=1,y最大=-2