急！f1(t)[f2(t)*f3(t)]等于[f1(t)f2(t)]*[f1(t)f3(t)]吗？_百度知道
急！f1(t)[f2(t)*f3(t)]等于[f1(t)f2(t)]*[f1(t)f3(t)]吗？
提问者采纳
?不等,f1(t)[f2(t)*f3(t)]=f1(t)f2(t)*f3(t)
等于乘以其中一个，再卷积另一个？为什么？
f1(t)[f2(t)+f3(t)]=[f1(t)f2(t)]+[f1(t)f3(t)]
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出门在外也不愁英语阅读,打T、FDogs are good pets.They are very f__ to people and very beautiful,too.Most dogs get on very well with c__ and their parents.Others are good watch-dogs because they cry loudly when a s__ person arrives.When you buy a dog,an important thing to think about is it_百度作业帮
拍照搜题，秒出答案
英语阅读,打T、FDogs are good pets.They are very f__ to people and very beautiful,too.Most dogs get on very well with c__ and their parents.Others are good watch-dogs because they cry loudly when a s__ person arrives.When you buy a dog,an important thing to think about is it
Dogs are good pets.They are very f__ to people and very beautiful,too.Most dogs get on very well with c__ and their parents.Others are good watch-dogs because they cry loudly when a s__ person arrives.When you buy a dog,an important thing to think about is its s__ --buy a small dog if your home is small and a bigger one if y__is larger.Many people don't know how much to feed their dogs.Dogs eat a__anything!They like meat,rice and lots of other things.You can buy lots of food m__ for dogs in shop.Don't let your dogs eat too much.Feed it only once a day.Always l__ water for your dog.It can get thirsty very quickly,especially in s__.Remember that dogs need e__.You should take it for a walk every day.Don't keep your dog inside all day.单词分别是1.friendly 2.children 3.strange 4.size 5.yours 6.almost 7.made 8.leave 9.summer 10.exercise 1、dogs are our good friends( )2、watch--dogs will sleep of a strange person arrives3、if your home is big enough,you can choose a small dog( )4、dog like rice( )5、it is good for your dog to go for a walk every day( )
1T2F3F4T5T
TFFTT希望对你有帮助哦~
看图与话，不少于20个单词
Your dog is really to like sit in a happy place, such as park. he like to play with other children and also breath fresh air is good for you dog.
英语阅读，打
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谜语题目：试卷只填T和F（打一歌曲名）
谜语解析：只用填T和F的是判断题，常出现在与英语相关的考试中。T（true）代表正确的，F（false）代表错误的。该歌曲收录在范玮琪07年得专辑《哲学家》中。
谜语答案：是非题
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数学问题急！！！！！！！
f(x)在[t,t+2](t&0)上的最小值
(2)对x&(0,&),不等式2f(x)&g(x)恒成立，求实数a的取值范围
（3）证明对一切x&（0，&），都有lnx&[1/(e^x)-2/ex)]
(1)令f'(x)=lnx+1=0,得x=1/e,
当0&t&1/e时f(x）在[t,1/e]上是减函数，
在[1/e,t+2]上是增函数，
所以f(x)在[t,t+2]上的最小值是f(1/e)=-1/e；
当t&=e^(-1)时，f(x)在[t,t+2](t&0)是增函数，
f(x)在[t,t+2]的最小值是f(t)=tlnt.
(2)由不等式2f(x)≥g(x)
得2xlnx≥-x^2+ax-3 ，
即2lnx+x+3/x≥a,
令G(x)=2lnx+x+3/x，
对G(x)求导得
G'(x)=2/x+1-3/x^2=(x^2+2x-3)/x^2=(x+3)(x-1)/x^2
令G'(x)=0
得x=-3或x=1,
所以G(x)在(0,1)是减函数，在[1,∞)上是增函数，x=1是最小值点。
故有 G(x)的最小值是G(1)=4，
(3)由lnx&1/(e^x)-2/(ex)可得
lnx-[1/(e^x)-2/ex)]&0
令H(x)=lnx-[1/(e^x)-2/(ex)]
求导得 H'(x)=(1/x)+1/e^
(1)令f'(x)=lnx+1=0,得x=1/e,
当0&t&1/e时f(x）在[t,1/e]上是减函数，
在[1/e,t+2]上是增函数，
所以f(x)在[t,t+2]上的最小值是f(1/e)=-1/e；
当t&=e^(-1)时，f(x)在[t,t+2](t&0)是增函数，
f(x)在[t,t+2]的最小值是f(t)=tlnt.
(2)由不等式2f(x)≥g(x)
得2xlnx≥-x^2+ax-3 ，
即2lnx+x+3/x≥a,
令G(x)=2lnx+x+3/x，
对G(x)求导得
G'(x)=2/x+1-3/x^2=(x^2+2x-3)/x^2=(x+3)(x-1)/x^2
令G'(x)=0
得x=-3或x=1,
所以G(x)在(0,1)是减函数，在[1,∞)上是增函数，x=1是最小值点。
故有 G(x)的最小值是G(1)=4，
(3)由lnx&1/(e^x)-2/(ex)可得
lnx-[1/(e^x)-2/ex)]&0
令H(x)=lnx-[1/(e^x)-2/(ex)]
求导得 H'(x)=(1/x)+1/e^x+2/(ex^2)
先写到这里,等你补充说明后接着解答
，在[e^(-1),t+2]上是增函数，f(x)的最小值是f(e^(-1))=-e^(-1).当t&=e^(-1)时，f(x)在[t,t+2](t&0)是增函数，f(x)的最小值是f(t)=tlnt.
(2)由不等式2f(x)&g(x)得2xlnx&-x^2+ax-3 ，变形得2lnx+x+3/x&a,令H(X)=2lnx+x+3/x，对H(x)求导得H(x)&=2/x+1-3/x^2=(x^2+2x-3)/x^2=(x+3)(x-1)/x^2=0得x=-3或x=1,H(x)在(0,1)是减函数，在[1,&)上是增函数，x=1是最小点。H(x)的最小值是H(1）=0+1+3=4，所以a&=4.
(3)右端式子表达不好理解，能换一种表达吗
114.216.254.*
你把右边的式子除到左边
变成一个式子小于一
让后左边两项分别求导
求出最大值都是1/2
但两个极值点不同不能同时取最大值
即可证明左边小于一
Ω天魔劫火Ω
证明对一切x∈（0，∞），都有lnx&[1/(e^x)-2/(ex)]
您的举报已经提交成功，我们将尽快处理，谢谢！
f'(x)=x^2-2ex+m,
由g(x)&f'(x)得
m&lnx/x+2ex-x^2,记为h(x),x&0.
h'(x)=(1-lnx)/x^2+2...
大家还关注近视眼手术SBK中的LASIK，F-CAT LASIK和T-CAT LASIK有什么区别？做出来真的会有不同效果吗？急急急！！！_百度拇指医生
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问近视眼手术SBK中的LASIK，F-CAT LASIK和T-CAT LASIK有什么区别？做出来真的会有不同效果吗？急急急！！！
在两家不同医院问了，一家医院中的SBK有三种选择，价格递增，而第二家就只有一种，价格适中，我就怀疑是不是一种经营手段，求专家解释或做过手术的解释
所谓SBK是做手术瓣的方式，而F-CAT LASIK（Q值引导）和T-CAT LASIK（角膜地形图引导）是打激光时数据引导方式。简单的说SBK是手术方式，F-CAT LASIK和T-CAT LASIK是对度数准确性及非球面行而进行的优化，目前比较推崇的还是波前相差引导，不是Q值及角膜地形图引导。但具体其优越性能否体现还看咱自己眼睛的检查结果。
这三种手术方式不同ASEK：准分子激光角膜上皮磨镶术 LASEK是更新一代的准分子激光手术方法。
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* 由于网上问答无法全面了解具体情况，回答仅供参考，如有必要建议您及时当面咨询医生