分解因式
1.x²/4-9=(x/2+3)(x/2-3)
2.4(x-3)²-x(x-3)
=(x-3)[4(x-3)-x]
=(x-3)(3x-12)
=3(x-3)(x-4)
3.(7x-1)²-4x²
=(7x-1+2x)(7x-1-2x)
=(9x-1)(5x-1)
4.x(x-6)+9
=x²-6x+9
=(x-3)²
5.x(x-4)+4
=x²-4x+4
=(x-2)²
6.(2x-1)²+8x
=4x²-4x+1+8x
=4x²+4x+1
=(2x+1)²
7.(x-2)²-2x(x-2)
=(x-2)(x-2-2x)
=(x-2)(-x-2)
=-(x-2)(x+2)
8.x²-(2根号3)x+3
=(x-√3)²
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