1) (x-3y)² -3x+9y 2) (x²-2x)² +2x(x-2)+1

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1)(x-3y)²-3x+9y2)(x²-2x)²+2x(x-2)+11)(x-3y)²-3x+9y2)(x²-2x)²+2x(x-2)+1

1) (x-3y)² -3x+9y 2) (x²-2x)² +2x(x-2)+1
1) (x-3y)² -3x+9y 2) (x²-2x)² +2x(x-2)+1

1) (x-3y)² -3x+9y 2) (x²-2x)² +2x(x-2)+1
1) (x-3y)² -3x+9y
=(x-3y)²-3(x-3y)
=(x-3y)(x-3y-3)
2) (x²-2x)² +2x(x-2)+1
=(x²-2x)²+2(x²-2x)+1
=(x²-2x+1)²
=(x-1)的4次方

1) (x-3y)² -3x+9y
=(x-3y)² -3(x-3y )
=(x-3y)(x-3y-3)

2) (x²-2x)² +2x(x-2)+1
=[x(x-2)]²+2x(x-2)+1
=[x(x-2)+1]²
=(x²-2x+1)²
=[(x-1)²]²
=(x-1)^4