2^(3x+1)<=(1/4)^(x-2)

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1 | 2011-10-20 20:03:56 | 显示全部楼层 |阅读模式

2^(3x+1)<=(1/4)^(x-2)2^(3x+1)<=[(1/2)^2]^(x-2)2^(3x+1)<=(1/2)^2(x-2)2^(3x+1)<=2^2(2-x)2^(3x+1)<=2^(4-2x)3x+1<=4-2x3x+2x<=4-15x<=3x<=3/5...

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