在3个抽屉里放入10个文具盒,至少有一个抽屉里要放进 个文具盒.
=0.4=12: =6: = %.
÷8=3: =25%= 填小数.
0.75=3: =9÷ = %.
3÷ = :10==0.6.
= :20=75%