因式分解3x的n 2次方 27x的n次方
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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
x³-y³=x³-x²y+x²y-xy²+xy²-y³=x²(x-y)+xy(x-y)+y²(x-y
(x-y)²+3(y-x)=(x-y)²-3(x-y)=(x-y)[(x-y)-3]=(x-y)(x-y-3)
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^8+x+1=(x^8-x^2)+(x^2+x+1)=x^2(x^6-1)+(x^2+x+1)=x^2(x^3-1)(x^3+1)+(x^2+x+1)=x^2(x-1)(x^2+x+1)(x^3+1
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+y)的3次方-x-y=(x+y)的3次方-(x+y)=(x+y)[(x+y)的平方-1】=(x+y)(x+y+1)(x+y-1)
x^3-x=x(x^2-1)=x(x+1)(x-1)
x8+x7+x6-x7-x6-x5+x5+x4+x3-x4-x3-x2+x2+x+1,每3项合并即可(x²+x+1)
x^3-x=x(x^2-1)=x(x+1)(x-1)
提3x,得3x(1-4x^2)平方差公式的运用3x(1+2x)(1-2x)
原式=X(X^4-2X^3+X^2-2X+1)
4x的4次方+x平方-3因式分解=(4x²-3)(x²+1)
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^3-9x=x(x^2-9)=x(x+3)(x-3)