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已知|x|=3x+1,则(64x2+48x+9)2005=______.
人气:441 ℃ 时间:2019-09-15 01:27:42
解答
|x|=3x+1,
x=3x+1或x=-3x-1,
解得x=-
1
2
或x=-
1
4

(64x2+48x+9)2005
=[(8x+3)2]2005
=(8x+3)5000
x=-
1
2
时,(8x+3) 5000=[8×(−
1
2
)+3]5000
=1;
x=-
1
4
时,(8x+3) 5000=[8×(−
1
4
)+3]5000
=1.
故答案为:1.
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