(y+3)²(y-3)²等于几(过程也要)急!
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(y+3)²(y-3)²等于几(过程也要)急!
(y+3)²(y-3)²等于几(过程也要)急!
(y+3)²(y-3)²等于几(过程也要)急!
(y+3)平方(y-3平方)
=[(y+3)(y-3)]平方
=(y平方-9)平方
=y的4次方-18y平方+81