画出互相垂直的两条直径．
先看清左右两题之间的关系，再写出得数．========
算一算．×3=×4=×2==÷3=÷4=÷2=÷2=
开火车．
直接写得数===== 9×= 0.8﹣==
× 6×8+÷ 2.4× 1﹣72%
=
=
=
=
=
=
=
=
×3=
×4=
×2=
=
÷3=
÷4=
÷2=
÷2=
=
=
=
=
= 9×
= 0.8﹣
=
=
×
6
×8
+
÷
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