在有理数范围内因式分(1)16(6x-1)(2x-1)(3x+1)(x-1)+25=______.(2)(6x-1)(2x-1)(3x-1

2025-01-04 12:30:21
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回答1:

(1)16(6x-1)(2x-1)(3x+1)(x-1)+25,
=[(6x-1)(4x-2)][(6x+2)(4x-4)]+25,
=(24x 2 -16x+2)(24x 2 -16x-8)+25,
=(24x 2 -16x) 2 -6(24x 2 -16x)-16+25,
=(24x 2 -16x) 2 -6(24x 2 -16x)+9,
=(24x 2 -16x-3) 2

(2)(6x-1)(2x-1)(3x-1)(x-1)+x 2
=[(6x-1)(x-1)][(2x-1)(3x-1)]+x 2
=(6x 2 -7x+1)(6x 2 -5x+1)+x 2
=(6x 2 -6x+1-x)(6x 2 -6x+1+x)+x 2
=(6x 2 -6x+1) 2 -x 2 +x 2
=(6x 2 -6x+1) 2

(3)(6x-1)(4x-1)(3x-1)(x-1)+9x 4
=[(6x-1)(x-1)][(4x-1)(3x-1)]+9x 4
=(6x 2 -7x+1)(12x 2 -7x+1)+9x 4
令t=6x 2 -7x+1,则12x 2 -7x+1=t+6x 2
∴原式=t(t+6x 2 )+9x 4
=t 2 +6?t?x 2 +9x 4
=(t+3x 2 2
=(6x 2 -7x+1+3x 2 2
=(9x 2 -7x+1) 2