(1)-x²+x²*y² (2)2x平方-12x+18 (3)16(x+y)²-25(x-y)(a²+b²)²-4ab(a²+b²)+4a²b²
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(1)-x²+x²*y² (2)2x平方-12x+18 (3)16(x+y)²-25(x-y)(a²+b²)²-4ab(a²+b²)+4a²b²
(1)-x²+x²*y² (2)2x平方-12x+18 (3)16(x+y)²-25(x-y)
(a²+b²)²-4ab(a²+b²)+4a²b²
(1)-x²+x²*y² (2)2x平方-12x+18 (3)16(x+y)²-25(x-y)(a²+b²)²-4ab(a²+b²)+4a²b²
(1)-x²+x²*y²
=x²(y²-1)
=x²(y+1)(y-1)
(2)2x平方-12x+18
=2(x²-6x+9)
=2(x-3)²
(3)16(x+y)²-25(x-y)
=[4(x+y)+5(x-y)][4(x+y)-5(x-y)]
=(9x-y)(9y-x)
(a²+b²)²-4ab(a²+b²)+4a²b²
=[(a²+b²)+2ab][(a²+b²)-2ab]
=(a+b)²(a-b)²