记p=lg(1/3)^lg2*2^lg30,求p的值,要求详解,
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记p=lg(1/3)^lg2*2^lg30,求p的值,要求详解,
记p=lg(1/3)^lg2*2^lg30,求p的值,要求详解,
记p=lg(1/3)^lg2*2^lg30,求p的值,要求详解,
是 p =(1/3)^(lg2) *2^(lg30) 吗?
= = = = = = = = =
因为 p =(1/3)^(lg2) *2^(lg30) ,
两边取对数, 得
lg p =(lg2) *lg(1/3) +(lg30) *(lg2)
=(lg2) *( -lg3) +(1+lg3) *(lg2)
=lg2,
所以 p =2.
= = = = = = = = =
说明:
(1) xy (x乘以y) 取对数后变成 lg x +lg y.
(2) x^y (x的y次方) 取对数后变成 y lg x.
即 幂变乘, 乘变加.
取指数
lg1+lg2+lg3=lg(1+2+3)
1/2lg(x-3)+lg根号4x+1=lg2+1/2lg3
解方程lg(x+7)-3lg2=2lg3
(lg2/lg3+lg2/2lg3)*(lg3/2lg2+lg3/3lg2)=?
已知lg2=0.3010,lg3=0.4771,计算:(1)lg9/2;(2)lg3.6;(3)lg根号6/2
lg(2x)*lg(3x)=lg2*lg3
(lg根号27+lg8-3lg根号10)/lg3+2lg2-1
设lg2=a lg3=b 那么lg根号下1.8等于多少1/2lg(32/49)-4/3lg根号8+lg根号245
(log23+lOg427)(log34+log98)= 23中2是底数3是真数,4是底数,3是底数,9是底数(log23+lOg427)(log34+log98)=(lg3/lg2+lg27/lg4)(lg4/lg3+lg8/lg9)=(lg3/lg2+3lg3/2lg2)(2lg2/lg3+3lg2/2lg3)=(5lg3/2lg2)(7lg2/2lg3)=(5/2)(7/2)=35/4为什么(lg3/lg2+3lg
lg2=a lg3=b 则lg 2 15!
解方程:lg(4^x+2)=lg2^x+lg3
方程lg(4^x+2)=lg2^x+lg3^x
已知lg2=0.3010,lg3=0.4771 求 lg32=?lg3/2=?lg根号3/2=?
lg2=0.3010 ,lg3=0.4771lg6=?lg3/2=?lg√3=?(√是根号)
记p=lg(1/3)^lg2*2^lg30,求p的值,要求详解,
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