分别求出下面各图形中阴影部分的周长或面积．
脱式计算，能简算的要简算． ①②③ ④⑤⑥15×4.6﹣46×0.5．
看谁算的又对又快．+=+=﹣=﹣= 1﹣=+=﹣= 1﹣=+=﹣=+=+=
看谁算得快． 1﹣﹣﹣+ 0.75+++0.25+0.625．
6﹣3﹣0.625．
计算．
②
③
⑤
⑥15×4.6﹣46×0.5．
+
=
=
﹣
=
﹣
=
=
+
﹣
= 1﹣
=
+
=
﹣
=
+
=
+
=
﹣
﹣
+
+
+0.25+0.625．
﹣3
﹣0.625．
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