1- 6y+y²1- 6y+y² 就这题,

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1- 6y+y²1- 6y+y² 就这题,

1- 6y+y²1- 6y+y² 就这题,
1- 6y+y²
1- 6y+y² 就这题,

1- 6y+y²1- 6y+y² 就这题,
1- 6y+y²
=9-6y+y²-8
=3²-6y+y²-8
=(3-y)²-8