分解因式-(x+2)²+16(x-1)²

要过程。谢谢!
2025-05-19 05:57:11
推荐回答(5个)
回答1:

解:原式=-(x²+4x+4)+16(x²-2x+1)
=-x²-4x-4+16x²-32x+16
=15x²-36x+12
=3(5x²-12x+4) 十字相乘法分解
=3(x-2)(5x-2)

回答2:

-(x+2)²+16(x-1)²
=[4(x-1)]²-(x+2)²
=[4(x-1)-(x+2)]*[4(x-1)+(x+2)]
=(4x-4-x-2)*(4x-4+x+2)
=(3x-6)*(5x-2)
=3(x-2)(5x-2)

回答3:

-(x+2)²+16(x-1)²
=[4(x-1)]²-(x+2)²
=(4x-4-x-2)(4x-4+x+2)
=(3x-6)(5x-2)

回答4:

原式=[4(x-1)+(x+2)][4(x-1)-(x+2)]
=(5x-2)(3x-6)
=3(5x-2)(x-2)

回答5:

-(x+2)²+16(x-1)² =-(x²+4x+4)+16(X²-2x+1)==15X²-36X+12=3(X-2)(5X-2)