(lg2+lg5-lg1)/(2lg+lg8) x (lg32-lg2)
=( lg2 + lg5 - 0)/(lg2 + lg8) x (lg32 - lg2)
=lg(2 x 5)/lg(2 x 8) x lg (32÷2）
＝lg10/lg16 xlg16
= 1