我急用.(不会的别答)全都要有过程...
我急用.(不会的别答)全都要有过程...
1.(lg根号27+lg8-3lg根号10)/lg1.2=_______
2.4lg2+3lg5-lg1/5=__________
3.(1+0.5lg9-lg240)/(1-2/3 lg27+lg36/5)=__________
4.已知函数f(x)=loga【a在下面】(x+1),g(x)=loga{a在下面}(1-x)(a>0且a不等于1)
(1)求f(x)+g(x)的定义域.
(2)判断f(x)+g(x)奇偶数,说明理由.
5.f(x)=log0.5【0.5在log下面】x,当x属于[a,a²],函数最大值比最小值大3,则a=________
6.已知2lg(x-2y)=lgx+lgy,则x/y的值是_______
1.(lg根号27+lg8-3lg根号10)/lg1.2=_______
2.4lg2+3lg5-lg1/5=__________
3.(1+0.5lg9-lg240)/(1-2/3 lg27+lg36/5)=__________
4.已知函数f(x)=loga【a在下面】(x+1),g(x)=loga{a在下面}(1-x)(a>0且a不等于1)
(1)求f(x)+g(x)的定义域.
(2)判断f(x)+g(x)奇偶数,说明理由.
5.f(x)=log0.5【0.5在log下面】x,当x属于[a,a²],函数最大值比最小值大3,则a=________
6.已知2lg(x-2y)=lgx+lgy,则x/y的值是_______
数学人气:535 ℃时间:2020-05-14 09:36:32
优质解答
1.(lg根号27+lg8-3lg根号10)/lg1.2=(3/2lg3+3lg2-3/2)/(lg12-1)=(3/2)(lg3+2lg2-1)/(lg3+2lg2-1)=3/22.4lg2+3lg5-lg1/5=lg2^4+lg5^3+lg5=lg(2^4*5^4)=lg10^4=43.(1+0.5lg9-lg240)/(1-2/3 lg27+lg36/5)=(lg10+lg3-l...
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