-121分之25乘以n的三次方+0.64乘以n

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-121分之25乘以n的三次方+0.64乘以n
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-121分之25乘以n的三次方+0.64乘以n
-121分之25乘以n的三次方+0.64乘以n

-121分之25乘以n的三次方+0.64乘以n
-25/121*n^3+0.64*n
=-n[(5n/11)^2-0.8^2]
=-n(5n/11+0.8)(5n/11-0.8)