全国有小学生约(一亿五千一百五十万七千一百)人.写作: .
0.6== :10=4.5÷ = %
÷20=6÷8=== :4.
÷10=0.8= : == %
÷ =0.375== :32= %
2:5= :10=10÷ = (填小数)