2(x)^x = ??
回答 (2)
2007-03-04 10:03 pm
✔ 最佳答案
4^x - 4^(x-1) = 24 4^x -4^x/4 =24
4*4^x-4^x=96
3*4^x=96
4^x=32
(2^2)^x=2^5
2^2x=2^5
Thus, 2x=5
x=2.5
2(2.5)^2.5
=19.8(corr to 3 sig. fig.)
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