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设对所有实数x，不等式x2log2 4(a+1)/a+2xlog2 2a/(a+1)+log2 (a+1)2/(4a2)>0恒成立，求a的取值范围.
由题意得 令z=log2 2a/(a+1)，则③式变为z2-(log28-z)(-2z)<0,化简为z(6-z)<0解得z<0或z>6. ④②式变为log28-z>0,即z<3...
英：Find the value of , when x=1.汉：当x=1时,求之值.
A man borrows $5000 at 4 percent compound interest, if the principal and interest are to be repaid by 10 equal instalments, find the amount of each instalment; having given 1g 1.04 =0.0170333 and lg675565=5.829667.
求4x+49y-28之平方根.
试求 (根号内至无穷)
∛17与∜21之两数孰大________.
方程=5-16的所有正实数解的乘积为________.
求a³/b及b³/a之正等比中项.
Evaluate to four significant figure by logarithm,
函数y=lg10x中，x的取值范围是__________.
(-)0+4-2×()-1/2 - (0.01)0.5
函数y=10lgx中，x的取值范围是__________.
已知a,b为实数，并且e<a<b，其中e是自然对数的底，证明 ab>ba.
若定义在区间(-1,0)内的函数f(x)=log2a(x+1)满足f(x)>0,则a的取值范围是【 】
青少年视力是社会普遍关注的问题，视力情况可借助视力表测量，通常用五分记录法和小数记录法记录视力数据，五分记录法的数据L和小数记录法的数据V满足L=5+lgV，已知某同学视力的五分记录法的数据为4.9，则其视力的小数记录法的数据约为(≈1.259)【 】
设a=2ln1.01,b=ln1.02,c=-1，则【 】
(2lg2+lg3)/(2+lg0.36+2/3 lg8)
河北省对数函数
求(lg3+lg2)/(1/4 lg16++1/2 lg0.09)的值.(其中lg表示以10为底的对数)
已知lg2=0.3010,lg3=0.4771，求lg.
设logx(2x2+x-1)>logx2-1，则x的取值范围为【 】.
若方程式ax³+3bx²+3cx+d=0有二相等之根，则其系数间之关系为(bc-ad)²=4(ac-b²)(bd-c²)试证之.
There are two groups of boys on the street corner. One boy leaves the first group and joins the second. The groups are then equal in size. If one boy had left the second group and joined the first, the first group would then have been three times as large as the second. Find the original size of each group.
Solve and verify x²+3x-6(x²+3x-3)1/2+2=0
Determine the real value of k, so that the roots of equation, (k - 1)x² - kx - 2x + 4 = 0, may be real and equal.
清华大学解方程
南京大学解方程
武汉大学解方程
解方程x²+4x-1+=0
解方程x5-1=0.
