0.5×0.15的积是 位小数;0.29×0.07的积是 位小数.
15÷ =0.6= %= :20= 折.
20%= ÷40= <填小数>=× = 成.
== ÷ = (最简分数)
3﹕ ==0•375=6÷ = %
=0.4=12: =6: = %.