钟表的指针从12绕O逆时针旋转90°到3. .(判断对错)
: =40 =80%= ÷40.
填上适当的数.7÷13= = ÷÷7= 9cm=dm.
=12: =0.75= %
= : =27÷ =.
÷2== 折= %=0.75.