开车时方向盘的转动是 现象,拨算盘时算珠的运动是 现象.
3﹕ ==0•375=6÷ = %
=0.4=12: =6: = %.
÷8=3: =25%= 填小数.
0.75=3: =9÷ = %.
3÷ = :10==0.6.