比较0.4^0.25 0.25^0.25 log0.25 0.5大小
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比较0.4^0.250.25^0.25log0.250.5大小比较0.4^0.250.25^0.25log0.250.5大小比较0.4^0.250.25^0.25log0.250.5大小0.4^0.2
比较0.4^0.25 0.25^0.25 log0.25 0.5大小
比较0.4^0.25 0.25^0.25 log0.25 0.5大小
比较0.4^0.25 0.25^0.25 log0.25 0.5大小
0.4^0.25,0.25^0.25均为幂函数,幂指数相同
则底数较大者,数值较大
故有 0.4^0.25>0.25^0.25
log0.25 0.5=ln0.5/ln0.25=ln0.5/(2ln0.5)=0.5=0.5^1
而0.25^0.25=0.5^(2*0.25)=0.5^0.5
0.5^0.5,0.5^1均为指数函数,底数相同,且00.25^0.25>log0.25 0.5
显然正数,开相同次方,被开方数越大,结果越大,所以0.4^0.25 大于0.25^0.25,0.25^0.25算出来是二分之根号二, log0.25 0.5算出来是二分之一,所以题目顺序就是从大到小
0.4^0.25 > 0.25^0.25 >0.5> log0.25
首先,0.25<1,所以log0.25<0
(0.4^0.25)^4=0.4
(0.25^0.25)^4=0.25
0.5^4=0.0625