若(2x-x-1)的三次方=a0+a1x+a3x3+a4x4+a5x5+a6x6,则a1+a3+a5=?
人气:210 ℃ 时间:2020-03-22 01:24:45
解答
当x=1时(2-1-1)³=a0+a1+a2+a3+a4+a5+a6 即a0+a1+a2+a3+a4+a5+a6 =0 ①当x=-1时(2+1-1)³=a0-a1+a2-a3+a4-a5+a6 即a0-a1+a2-a3+a4-a5+a6=8 ②①-②得2a1+2a3+2a5=-8∴a1+a3+a5=-4真的吗?那么a2+a4+a5=?这个不能用特殊方法算出a2+a4+a6可以你确定?那么a2+a4+a6=5吗?是5还有a0=-1 请采纳
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