x -2x二次方 4x三次方 -8x四次方,第n个数是-搜答案-智慧作业帮

x^2=y+4,所以x^2-y=4y^2=x+4,所以y^2-x=4x^3-2xy+y^3=（x^3-xy）+（y^3-xy）=x（x^2-y）+y（y^-x）=4x+4yx^2=y+4,y^2=x+

原式=(8x^6-6x^6-12x^5)÷(-2x²)=(2x^6-12x^5)÷(-2x²)=-x^4+6x³再问：=(2x^6-12x^5)÷(-2x²)=

lim(x³-2x-5)/(7x³+5x²+6x+8)x→0=(0-0-5)/(0+0+0+8)=-5/8

5x³-6x²+15x-28____________________x+2)5x⁴+4x³+3x²+2x+15x⁴+10x³_

(x^3-4x^2+3x)/(x^3+3x^2-4x)=x(x-3)(x-1)/x(x+4)(x-1)=(x-3)/(x+4)

1.(-2x²)³-(-x³)²=-8x^6-x^6=-9x^62（-x）^8×（y^6）^(1/2)（x⁴×y⁴）²×y&#

/>X²-6X+8=0X²-6X+9=1(x-3)²=1于是[2(X-3)²]³÷(X-3)²=8[(X-3)³]²÷(

若多项式a的二次方x的三次方+ax的三次方-4x的三次方+2x的二次方+x+1是关于x的二次多项式（a为常数）那么a^2+a-4=0所以a=[-1±√(1+16)]/2=(-1±√17)/2代入求即可

1.x³-2x²y+xy²=x(x²-2xy+y²)=x(x-y)²2.8a²b-2b=2b(4a²-1)=2b(2a-

原式=x²×(-x³)+2x×(x的4次方)+x×x的4次方=-x的5次方+2x的5次方+x的5次方=2x的5次方很高兴为您解答,祝你学习进步!【学习宝典】团队为您答题.有不明白的

A-B/2=2X^3+3X^2-X-(2X^3+4X^2-X+3)=-X^2-3=-1/4-3=-13/4

=2x^3+4x-1/3x^2-x-3x^2+2x^3=4x^3-10/3x^2+3x=4(-3)^3-10/3(-3)^2+3*(-3)=4*(-27)-10/3*9-9=-108-39=-147

3x三次方2x二次方-{5x-2-[6-2x-(-x二次方+3x三次方)]=6X^5-[5X-2-6+2X+(-X^2+3X^3)]=6X^5-(7X-8-X^2+3X^3)=6X^5-3X^3+X^

x^4+4x^3+4x^2-9=x^2(x^2+4x+4)-9=x^2(x+2)^2-9=[x(x+2)]^2-9=(x^2+2x)^2-9=(x^2+2x+3)(x^2+2x-3)=(x^2+2x+

1x³-2x²-7x-4=x³+2x²+x-4x²-8x-4=x(x²+2x+1)-4(x²+2x+1)=(x-4)(x²

原式=(8x³+4x²)-(2x+1)=4x²(2x+1)-(2x+1)=(2x+1)(4x²-1)=(2x+1)²(2x-1)

2x³+3x³-4x³=(2+3-4)x³=x³

=(x^2)(y^2)(7y-8xz)/(8x^2*y^2)=7y/8-xz

=x²(x-1)/x(x-1)-(1+x)(1-x)/(x+1)=x-(1-x)=2x-1当x=2时原式=4-1=3

17x的9次方,上式为2x的9次方-64x的9次方+81x的9次方