在边长为2cm的正方形内画一个最大的圆．怎样确定它的圆心和半径？
直接写得数，做到又对又快．×=÷1.5=× = 6﹣﹣=÷ = 0÷5×= 5﹣4÷5= 2×÷2×=
÷×÷× 120÷ 120×÷21×21．
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．
×
=
÷1.5=
× =
6﹣
﹣
=
÷ =
0÷5×
= 5﹣4÷5= 2×
÷2×
÷
÷
×
÷21
=
=
=
=
=
=
=
=
×3=
×4=
×2=
=
÷3=
÷4=
÷2=
÷2=
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