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已知代数式ax 5 +bx 3 +3x+c，当x=0时，该代数式的值为-1． （1）求c的值；答：c=______ （2）已知当x=1时，该代数式的值为-1，试求a+b+c的值；答：a+b+c=______． （3）已知当x=3时，该代数式的值为9，试求当x=-3时该代数式的值；答：该代数式的值为：______．
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