log的计算 :log2(20)-log4(25)= log3(2)×log2(5)×log5(3)=?log2[log2(32)-log2(3÷4)+log2log的计算 :log2(20)-log4(25)= log3(2)×log2(5)×log5(3)=?log2【log2(32)-log2(3÷4)+log2(6)】=?lgx+lg(x+15)=2 ..X
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log的计算 :log2(20)-log4(25)= log3(2)×log2(5)×log5(3)=?log2[log2(32)-log2(3÷4)+log2log的计算 :log2(20)-log4(25)= log3(2)×log2(5)×log5(3)=?log2【log2(32)-log2(3÷4)+log2(6)】=?lgx+lg(x+15)=2 ..X
log的计算 :log2(20)-log4(25)= log3(2)×log2(5)×log5(3)=?log2[log2(32)-log2(3÷4)+log2
log的计算 :log2(20)-log4(25)= log3(2)×log2(5)×log5(3)=?log2【log2(32)-log2(3÷4)+log2(6)】=?lgx+lg(x+15)=2 ..X的值?
log的计算 :log2(20)-log4(25)= log3(2)×log2(5)×log5(3)=?log2[log2(32)-log2(3÷4)+log2log的计算 :log2(20)-log4(25)= log3(2)×log2(5)×log5(3)=?log2【log2(32)-log2(3÷4)+log2(6)】=?lgx+lg(x+15)=2 ..X
1、log2(4*5)-(2/2)log2(5)=log2(4)+log2(5)-log2(5)=2 ;
2、换底公式:(lg3/lg2)*(lg5/lg2)*(lg5/lg3)=1 ;
3、log2(5-log2(3)+log2(4)+log2(2)+log2(3))=log2(8)=3 ;
4、lg(x*x+15x)=2 ,x*x+15*x=100,(x+20)(x-5)=0,x=5(15x>0,所以舍掉-20).
log2(20)-log4(25)=2
log3(2)×log2(5)×log5(3)=1
log2【log2(32)-log2(3÷4)+log2(6)】=
lgx+lg(x+15)=2 ..X=
2 1 3 5
2 ,1 ,3 ,X=5