当x=3时
y=ax＾5+bx＾3+cx-5=a*3＾5+b*3＾3+c*3-5=6
a*3＾5+b*3＾3+c*3=11
-[a*3＾5+b*3＾3+c*3]=-11
a（-3）＾5+b（-3）＾3+c（-3）=-11
x等于负3时
y=ax＾5+bx＾3+cx-5=a（-3）＾5+b（-3）＾3+c（-3）-5=-11-5=-16

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