一、單項(xiàng)選擇題(本大題共8小題,每小題5分,共計(jì)40分.在每小題給出的四個(gè)選項(xiàng)中,只有一個(gè)是符合題目要求的,請(qǐng)把答案添涂在答題卡相應(yīng)位置上)
1.下列導(dǎo)數(shù)運(yùn)算正確的是
A.(C為常數(shù)) B.
C.(e為自然對(duì)數(shù)的底數(shù)) D.
2.已知(i是虛數(shù)單位),則復(fù)數(shù)z的共軛復(fù)數(shù)=
A.1﹣3i B.﹣1﹣3i C.﹣1+3i D.1+3i
3.函數(shù)圖象的對(duì)稱軸為直線x=1,則實(shí)數(shù)a=
A.﹣1 B.0 C.1 D.1或﹣1
4.已知隨機(jī)變量服從正太分布N(1,),若P(<4)=0.8,則P(﹣2<<1)=
A.0.2 B.0.3 C.0.5 D.0.6
5.展開式中的常數(shù)項(xiàng)是