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(x-y)³-4(x-y)
=(x-y)[(x-y)²-4]
=(x-y)(x-y+2)(x-y-2)
1、=2xy(3x²y-2xy²+1)
2、=-y(9x²-6xy+y²)
=-y(3x-y)²
3、=a²/2(x-2a)²+a/4(x-2a)³
=a/4(x-2a)² (2a+1)
4、=[2(x+y)]²-[3(x-y)]²
=(2x+2y+3x-3y)(2x+2y-3x+3y)
=(5x-y)(5y-x)
5、2a(a²-16)
=2a(a+4)(a-4)
6、3x(x²+4x+4)
=3x(x+2)²
7、(x-y)³-4(x-y)
=(x-y)[(x-y)²-4]
=(x-y)(x-y+2)(x-y-2)
8、(x的4次方+2x²+1)(x的4次方-2x²+1)
=(x²+1)²(x²-1)²
=(x²+1)²(x+1)²(x-1)²
=(x-y)[(x-y)²-4]
=(x-y)(x-y+2)(x-y-2)
1、=2xy(3x²y-2xy²+1)
2、=-y(9x²-6xy+y²)
=-y(3x-y)²
3、=a²/2(x-2a)²+a/4(x-2a)³
=a/4(x-2a)² (2a+1)
4、=[2(x+y)]²-[3(x-y)]²
=(2x+2y+3x-3y)(2x+2y-3x+3y)
=(5x-y)(5y-x)
5、2a(a²-16)
=2a(a+4)(a-4)
6、3x(x²+4x+4)
=3x(x+2)²
7、(x-y)³-4(x-y)
=(x-y)[(x-y)²-4]
=(x-y)(x-y+2)(x-y-2)
8、(x的4次方+2x²+1)(x的4次方-2x²+1)
=(x²+1)²(x²-1)²
=(x²+1)²(x+1)²(x-1)²
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