(a-1)·a·(a+1)等于几

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(a-1)·a·(a+1)等于几
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(a-1)·a·(a+1)等于几
(a-1)·a·(a+1)等于几

(a-1)·a·(a+1)等于几
a³-a

a 的三次方减A