(x+3)的平方-(X-1)(X+2)谢谢了,

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(x+3)的平方-(X-1)(X+2)谢谢了,
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(x+3)的平方-(X-1)(X+2)谢谢了,
(x+3)的平方-(X-1)(X+2)谢谢了,

(x+3)的平方-(X-1)(X+2)谢谢了,
(x+3)的平方-(X-1)(X+2) =x+6x+9-x-x+2 =5x+11