已知Ina+Inb=2In(a-2b),求log2^a\b的值.在线等,急求

已知Ina+Inb=2In(a-2b),求log2^a的值.在线等,急求 已知Ina+Inb=2In(a-2b), 则log√5 a/b=( ) A log5 16 B - log5 16 C 2In a/b D 2In b/a 请说明理由 谢谢 在三角形ABC中,2In(c^2-a^2-b^2=In2+2Ina+2Inb,则C= 怎么证明logb a=Ina/Inb, 1.计算Ina+Inb=2In(a-2b)求log8^(a/b)的值?2.已知f(x)=x^2+(lga+2)x+lgb,f(-1)=-2,当x属于R时,f(x)>=2x恒成立,求实数a 的值,并求此时f(x)的最小值?赶快了思考了? 2^a>2^b是Ina>Inb的什么条件,AA 充分不必要 B必要不充分 C充要条件 D既不充分也不必要 InA+InB=InAB怎么推啊? 已知tanA+sinA=a,tanA-inA=b,求证(a^2-b^2)^2=16ab. 高数中对数In的运算法则,比如Ina+Inb=?之类的,谢谢! 求y=Inx,x=0,y=Ina,y=Inb(b>a>0)围成图形的面积可是答案是a-b啊 已知a,b∈R,则Ina Ina×Inb为什么等于Ina的Inb次方 In是反函数的符号吗?InA+InB是不是等于InAB 求下列曲线所围成的平面图形的面积y=Inx y轴 y=Ina,y=Inb(a 已知函数f（x）=In（1+x）-x数列｛an｝满足：a1=1/2In2+Ina(n+1)=a(n+1)*an+f(a(n+1)*an)(n+1)是下标相当与an的n（1）求证IN(X+1)≤x（2）求数列｛an｝的通项公式（3）求证：a1+a2+a3+……+an（1）求证IN(X+1)≤x 已知f（x）=1+x-x^2,g（x）=Ina-Inx(a＞0）,若对于x＞0都有f(x)≤g(x),试求出实数a的取值范围. 1.Li Hong has ________ the army for 2 years.A.joined B.be in C.been in D.joined inA.children B.five years C.five years ago D.five years before 3.Mike ___________ the story for a month.A.has bought B.has had C.had had D.has borrowed 4.You ______ that a and b differ from ina and b differ from ...in...与A differ from B in...分别怎么用,有什么不同?