Question

已知f(x)=ln(a^x-b)的定义域为(-∞,1], 值域为[0,+∞),

已知f(x)=ln(a^x-b)（a>1且a≠1)的定义域为(-∞,1], 值域为[0,+∞),则a-b的取值范围是

Answer 1

a^x定义域(-∞,1],a^x是减函数；f(x)是增函数；f（x）值域为【0,+∞),
当 x=1时f（x）=0，a-b=1；

Answer 2

a^x定义域(-∞,1],a^x是减函数；f(x)是增函数；f（x）值域为【0,+∞),
当 x=1时f（x）=0，a-b=1；

Answer 3

reserve price is 1000 yuan
taller than 160cm,wholesale mac cosmetics, with every passing height less than 1cm +100 per
160cm,mulberry handbags, each low-1cm-100 元
+150
with long hair dancing +100
singing +100
weight over 110 pounds, more than 10 pounds each per
-100 100 pounds underweight, 10 pounds -100 dollars per poor
myopia, more than 300 degrees, 100 degrees -100 million
fallen in love, left behind a -100 million, a rejection of another 100 bucks
100 bucks not fallen in love over 23 years of age
,Mac makeup discount, each super- 1-year-old has a history of -100 per
, not every mahjong +100 -100 million dollars

not drink alcohol in the -200 +100 RMB yuan

pumping pet smoke -200
100 bucks. . Pet friendly plus 50
cook +300 million +100

gentle lovely ignorance. Total wayward -200
always told you want your students gathering +100
+100
would like to take you care about you. . Will not let you smoke. +100
Alcohol usually do not disturb your personal life +100
always haunt you shopping -100. .
will like the way you dress according to their own laundry +100
-200
not every day a quarrel -200
fight or not her fault. . +100
First find your total day you coax her to sleep +100 +100
behaved. . . Only good for you. . Others behaved the +200
will you cry +100
always makes you cry -100
not want to be very self you bought her +200
in your front of their friends will not willful +100
+100
disguise will give you the laundry +100
mature and +100
with you not love to laugh -200
You skip class to play with her hanging -200
1 Division -100
exam will give you something of her own making +100
always said you ugly -200
not had your ID's -200

Ha ha. . 1500 The following do not take it
1500 到 2500 到 3500
2500 normal quality
3500 availability of the above you in this life. . Hurry to marry it. . Late, there is no