含有字母的式子“5﹣1.2x+2+0.1x”可以化简为 ,当x=0.4时,这个式子的值是 .
: =0.125= %==.
9÷ == :8=0.75= %= 折.
=0.375= ÷24= %
:20==0.8=12÷ = %.
6÷ ==0.75= :40= %