把20克盐放入80克水中,含盐率为 .
:8=0.375=21÷ = %
=8÷20= %= 小数= :15.
﹦3÷ =75%=15: = (小数)
=== ÷8= (填小数).
:30= %="0.6=1" 2÷ = (填分数)