题目内容
已知y=ax5+bx3+cx-1，当x=-2时，y=5，那么当x=2时，y=______．
由题意可知，当x=-2时
y=ax5+bx3+cx-1
得y+1=ax5+bx3+cx
即ax5+bx3+cx=6
∴当x=-2时，ax5+bx3+cx=-6
∴当x=2时，y=ax5+bx3+cx-1=-6-1=-7．
y=ax5+bx3+cx-1
得y+1=ax5+bx3+cx
即ax5+bx3+cx=6
∴当x=-2时，ax5+bx3+cx=-6
∴当x=2时，y=ax5+bx3+cx-1=-6-1=-7．
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