因式分解:9x的3次方-18x的平方 9x
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x³-13x-12=x³-x-12x-12=x﹙x²-1﹚-12﹙x+1﹚=x﹙x-1﹚﹙x+1﹚-12﹙x+1﹚=﹙x+1﹚﹙x²-x-12﹚=﹙x+1﹚﹙x
6xy³-9x²y²-y^4=-y²(-6xy+9x²+y²)=-y²[(3x)²+2×3x×(-y)+(-y)&sup
x³-y³=x³-x²y+x²y-xy²+xy²-y³=x²(x-y)+xy(x-y)+y²(x-y
x^4+x^3-2=x^4-x^3+2x^3-2=x^3(x-1)+2(x^3-1)=x^3(x-1)+2(x-1)(x^2+x+1)=(x-1)[x^3+2(x^2+x+1)]=(x-1)(x^3+
=x(6x²-18x+3)=3x(2x²-6x+1)
x=-1,2使原式为0,所以(x+1),(x-2)是原式的因式原式=(4x^4-8x^3)-(8x^3-16x^2)-(7x^2-14x)+(5x-10)=(x-2)(4x^3-8x^2-7x+5)4
请问是3x^4-243吗?若是则如下:解原式=3(x^4-81)=3(x^2+9)(x^2-9)=3(x^2+9)(x+3)(x-3)
x^3-3x+2=x^3-3x+3-1=(x^3-1)-3(x-1)=(x-1)(x^2+x+1)-3(x-1)=(X-1)(x^2+x-2)=(x-1)^2(x+2)
x^3-x=x(x^2-1)=x(x+1)(x-1)
根据x^n-1=(x-1)(1+x+x^2+..+x^(n-1))得原式=(x^18-x^3)/(x^3-1)+23=(x^18+22x^3-23)/(x^3-1)
x^3-x=x(x^2-1)=x(x+1)(x-1)
6(x-y)的3次方+15(y-x)的2次方-9(y-x)的3次方=6(x-y)的3次方+15(x-y)的2次方+9(x-y)的3次方=15(x-y)的3次方+15(x-y)的2次方=15(x-y)的
提3x,得3x(1-4x^2)平方差公式的运用3x(1+2x)(1-2x)
1+x的5次方减x的3次方减x的2次方=(x^5-x³)-(x²-1)=x³(x²-1)-(x²-1)=(x³-1)(x²-1)=
因式分解(x-y)的平方-(y-x)的3次方(x-y)的平方-(y-x)的3次方=(x-y)^2+(x-y)^3=(x-y)^2(x-y+1)
4x4-4x3+x2=x2(4x2-4x+1)=x2(2x-1)2
(x+y)²-(9y)²=(x+y+3y)(x+y-3y)=(x=4y)(x-2y)(x+y)²-(9y)³=(x+y)²-(729y³)=
X^3-9x=x(x^2-9)=x(x+3)(x-3)