如图:(1)指针从“12”绕点O顺时针旋转30°到 .(2)指针从“3”绕点O顺时针旋转 °到“6”.(3)指针从“6”绕点O顺时针旋转 °到“12”.
=12: =0.75= %
= : =27÷ =.
÷2== 折= %=0.75.
3:8= ÷ =.
:10=0.2= ÷25= %