x加y乘多少=x4次方减y4次方
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x²-3x+1=0x²+1=3x两边平方x4次方+2x²+1=9x²x4次方+1=7x²两边平方x8次方+2x4次方+1=49x4次方x8次方+1=4
x^2-3x+1=0x^2+1=3x两边同除以xx+1/x=3x^2+1/x^2=(x+1/x)^2-2=9-2=7x^4+1/x^4=(x^2+1/x^2)^2-2=49-2=47
原式分解因式得x^3y^3(2x-y)=(xy)^3(2x-y)=8/3.(x^3表示x的3次方)
2x³y/3+2ab²-y^4-12x³第一和第三项都是四次项第二和第四项都是三次项所以是四次四项式最高次项是2x³y/3和-y^4
(x-y)(x+y)(x2+y2)(x4+y4)(x8+y8),=(x2-y2)(x2+y2)(x4+y4)(x8+y8),=(x4-y4)(x4+y4)(x8+y8),=(x8-y8)(x8+y8)
x^2-4(x-1)=x^2-4x+4=(x-2)^2x^4-y^4=(x^2+y^2)(x^2-y^2)=(x^2+y^2)(x+y)(x-y)(5a^2+2a)-4(2+2a^2)=5a^2+2a
原式=(x4-xy3)+(y4-x3y)+(3xy2-3x2y)=x(x3-y3)+y(y3-x3)+3xy(y-x)=(x3-y3)(x-y)-3xy(x-y)=(x-y)(x3-y3-3xy)=(
1、x+y=a,xy=b①x²+y²=x²+2xy+y²-2xy=(x+y)²-2xy=a²-2b②x³+y³=(x
原式=(x²-y²)²=(x+y)²(x-y)²
∵x+y=a∴x2+y2+2xy=a2又∵x2+y2=b2∴2xy=a2-b2x4+y4=(x2+y2)2-2x2y2=(x2+y2)2-(2xy)22=b4−(a2−b2)22=-12a4+a2b2
20x2+253x+800=(5X+32)(4X+25)(x+y)²=(x+y)²(x+y)²=(x²+y²+2xy)²=(x²+
4分之x4次方y8次方-6x平方y平方+36y4次方=(1/2x²y的4次方-6y²)²如果本题有什么不明白可以追问,
1)2x³y—4x平方y平方+2xy³=2xy(x²-2xy+y²)=2xy(x-y)²2)x4次方—2x平方y平方+y4次方=(x²-y&
弱弱的问下是不是括号x的4次方加y的4次方乘括号x的平方加y的平方乘括号X加y乘括号x减y才是题目呀是的话→(x⁴+y⁴)(x²+y²)(x+y)(x-y)
x^2+y^2+6x-4y+13=0(x^2+6x+9)+(y^2-4y+4)=0,(x+3)^2+(y-2)^2=0,x=-3,y=2,(x+y)^2008=(-3+2)^2008=(-1)^200
yx^3+xy^3=xy(x^2+y^2)=xy[(x+y)^2-2xy]=-6*[0-2*(-6)]=-72
(x^4-y^4)÷(x^2+y^2)/(x+y)=(x^2-y^2)(x^2+y^2)÷(x^2+y^2)/(x+y)=(x^2-y^2)(x^2+y^2)*(x+y)/(x^2+y^2)=(x^2
X^2+y^2=(x+y)^2-2Xy=a^2-2bx3次方+y3次方=(x+y)(X^2+y^2-xy)=a(a^2-2b-b)=a^3-3abx4次方+y4次方=(x^2+y^2)^2-2x^2y
(a+b)平方-4b平方=(a+b+2b)(a+b-2b)=(a+3b)(a-b)二分之一x4次方-八分之一x平方y4次方=1/8x^2(4x^2-y^2)=1/8x^2(2x+y)(2x-y)
因为x²+4y²+x²y²-6xy+1=0(x²-4xy+4y²)+(x²y²-2xy+1)=0(x-2y)²