在○里填上“>”“<”或“=”.0.8○7.10 0.309○0.3 680厘米○6.80米.
== %=40: = (填小数)
0.6== :10=4.5÷ = %
÷20=6÷8=== :4.
÷10=0.8= : == %
÷ =0.375== :32= %