（1）画一个半径是1厘米的圆，并标出它的圆心、半径和直径．（2）画出下面各图形底边上的高．
直接写出得数．﹣=+=+=+= 1﹣=﹣= 3+=﹣= 3﹣1=+=+=+3=
．
直接写出得数．﹣= 0.7﹣0.62= 12÷25== 10=+×0= 13×= 10=
直接写得数．+=+= 1﹣=﹣=﹣=+=﹣1=﹣= 3﹣1=+=
做下面分数的加减法，结果能约分的要约分．+=+=﹣=
﹣
=
+
=
+
=
+
=
=
﹣
= 3+
=
﹣
=
+
+
=
+3
=
．
﹣
= 0.7﹣0.62= 12÷25=
=
=
+
×0= 13
×
= 10
=
+
+
= 1﹣
=
﹣
=
﹣
=
+
=
﹣1=
﹣
=
=
+
=
+
=
+
=
﹣
=
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