比较大小.503×6 530×6380×7 2680105×7 2680600×7 380×9950×4 4000402×3 240×5.
= %= 小数.
÷5=0.4== :40.
:12=== ÷9.
6÷ == :12= 折= %=0.75.
0.6== :20= %= 折.