已知導數f（x）=x^3+ax^2+x+1，a∈R （1）討論函數的單調區間 （2）設函數在區間（-2/3，-1/3）內是减函數，求a的取值範圍

已知導數f（x）=x^3+ax^2+x+1，a∈R （1）討論函數的單調區間 （2）設函數在區間（-2/3，-1/3）內是减函數，求a的取值範圍

f'（x）=3x^2+2ax+1
若-√3=0，
此時也是在R上遞增
a>√3，a

求y=1+x*e^y導數
如題

F（x，y）= 1+x*e^y -y
y=1+x*e^y導數
= -Fx/Fy
= -e^y/（x*e^y-1）

求y=（1+x^2）e^x的導數

y'=（2x）e^x +（1+x²；）e^x
=（1+2x+x²；）e^x
=（1+x）²；e^x

Y=e∧1/x+x√x的導數

複合導數，挺簡單的，答案是負X方分之一乘以e的X分之一次加上√X加上2√X分之X

英語同義詞的轉換
1 generally speaking，the child did a good job in the exam.
--------------------，the child did a good job in the exam.
2 he is likely to be the most suitable person for the job.
-------------------- he is the most suitable person for the job.
I saw her hurrying out，but didn't speak to her.
I ------------ her hurrying out，but didn't speak to her

1 generally speaking，the child did a good job in the exam.
In general，the child did a good job in the exam.
2 he is likely to be the most suitable person for the job.
It is possible that he is the most suitable person for the job
3.I saw her hurrying out，but didn't speak to her.
I caught sight of her hurrying out，but didn't speak to her

變複數句
It's an apple
That's a red knife
Is that your bag
This is a tiger
she isn't a doctor

They are apples.
Those are red knives.
Are those your bags？
These are tigers
They aren't doctors.

關於語文複句類型和關聯詞的練習
請幫我找些類似的練習

1.依次填入下麵橫線上的詞語，最恰當的一組是（）我們欣賞中外精彩的繪畫，可以舉出它們很多優點，瀟灑自然常常是它們共同的長處.畫師選擇某種素材入畫，可以經過十分嚴格的選擇，______體現於畫幅上，______往往十分自…

“否則”是何種關係的複句的關聯詞

否則：不過不這樣，那麼…
所以是“選擇”關係

用上恰當的關聯詞，將下麵三個短句組成一個複句.
：1.挫折並不能自發地造就人才2.在挫折中奮起，在挫折中追求，在挫折中堅守的人，有希望成為生活的强者. 3.不是所有經歷挫折的人都能有所作為.

雖然在挫折中奮起，在挫折中追求，在挫折中堅守的人，有希望成為生活的强者，但不是所有經歷挫折的人都能有所作為，即挫折並不能自發地造就人才.

用恰當的關聯詞將下麵三個短語組成一個複句.
1.在如此寒冷的雪夜裏，還有許多無家可歸者露宿者露宿街頭.
2.莫泊桑看到了雪夜的殘酷、陰冷和無奈.
3、雪夜應該是寧靜而柔和的

雪夜（本）應該是寧靜而柔和的，莫泊桑（卻）看到了雪夜的殘酷、陰冷和無奈，即使在如此寒冷的雪夜裏，還有許多無家可歸者露宿者露宿街頭.