1樓:匿名使用者
① 8x^2+22x+5
=(4x+1)(2x+5)
② x^3-2x^2+1
=x³-x²-x²+1
=x²(x-1)-(x-1)(x+1)
=(x-1)(x²-x-1)
2樓:匿名使用者
① 8x^2+22x+5
=(2x+5)(4x+1)
② x^3-2x^2+1
=x³-1-2x²+2
=(x-1)(x²+x+1)-2(x+1)(x-1)=(x-1)[(x²+x+1)-2(x+1)]=(x-1)(x²-x-1)
=(x-1)[x-(1+√5)/2][x-(1-√5)/2]
3樓:匿名使用者
① 8x^2+22x+5
=(4x+1)(2x+5)
② x^3-2x^2+1
=x³-x²-x²+1
=x²(x-1)-(x-1)(x+1)
=(x-1)(x²-x-1)
=(x-1)(x-(1+√5)/2)(x-(1-√5)/2)
4樓:創作者
(1)由十字相乘法,得:原式=(4x+1)(2x+5)(2)先猜根,即猜測方程x³﹣2x²+1=0的根,顯然x1=1所以,原式=x³﹣x²﹣x²+1
=x²(x﹣1)﹣(x+1)(x﹣1)
=(x﹣1)(x²﹣x﹣1)
=(x﹣1)(x﹣x2)(x﹣x3)
式中,x2,x3是方程x²﹣x﹣1=0的兩根,所以x2=½(1+√5),x3=½(1﹣√5)
5樓:匿名使用者
8x^2+22x+5=(2x+5)(4x+1)
x^3-2x^2+1=x^3-x^2-(x^2-1)=(x-1)(x^2-x-1)
分解因式8x 4 8x 3 2x 2 4x
解法一 8x 8x 2x 4x 1 8x 8x 2x 4x 4x 1 2x 4x 4x 1 4x 4x 1 2x 1 4x 4x 1 2x 1 2x 1 2x 1 解法二 8x 8x 2x 4x 1 8x 4x 4x 2x 4x 2x 2x 1 4x 2x 1 2x 2x 1 2x 2x 1 2x ...
因式分解 (x 3) 2x(x 3)0 x 5x 14 0 x 6x
x 3 2x x 3 0 x 3 x 3 2x 0 3 x 3 x 1 0 3 x 3 x 1 0 x 3或x 1 x 5x 14 0 x 7 x 2 0 x 7或x 2 x 6x 8 0 x 2 x 4 0 x 2或x 4 如果本題有什麼不明白可以追問,如果滿意記得采納如果有其他問題請採納本題後另...
分解因式x33x分解因式x33x
1 x 1 3x 3 將4寫成1 3 x 1 x x 1 3 x 1 x 1 x x 1 3 x 1 x 1 x 1 x 4x 4 x 1 x 2 2 x x 4x 4 3x x 4x x x 1 4 x 1 x 1 x 1 x 4x 4 x 1 x 2 3 x 2x x 4 3x 2x x x x...