lg12.5-lg5/8+lg5=多少
lg12.5-lg8分之5+lg5=?
lg2分之1减lg5分之8加lg12.5减log8的9次方×log27的8次方
lg2^2+lg2*lg5+lg5=lg2(lg2+lg5)+lg5
(lg5)^2+lg5.lg2=
已知lg2=a,lg3=b,则lg12/lg5=
已知lg2=a,lg3=b,试用a,b表示lg5/lg12
lg2为a lg3为b 试用ab表示log12(5) log12(5) =lg5/lg12 =(1-lg2)/(2lg2
(lg5)的平方+lg2*lg50=多少?
lg5*lg2等于多少?
lg5等于多少
lg5+ lg2等于多少
(lg2)^2+lg2*lg5+(lg5)^2=