如图．圆锥形的烟囱帽的底面直径是40cm，母线长是25cm，计算这个展开图的圆心角及面积．
直接写出得数 ①= ②= ③= ④1﹣= ⑤= ⑥= ⑦= ⑧1﹣= ⑨6﹣（）= ⑩=
计算．．
直接写得数．﹣= 1﹣=+=﹣=+=+7= 4﹣=﹣0.9=﹣=+=﹣1=++=
口算下面各题．+=﹣=+=﹣= 6.4+2.3= 7.3﹣0.4= 1.1+2.8= 707÷7= 360÷3= 93÷3= 40×25= 720÷4= 80﹣25= 36×0=
直接写得数 1﹣= 12﹣12×0.1=﹣= 0.3+= 1.66÷2=+= 7﹣= 23+52=﹣0.75= 50×25×1.2=
= ②
= ③
= ④1﹣
= ⑤
=
= ⑦
= ⑧1﹣
= ⑨6﹣（
）= ⑩
=
．
﹣
= 1﹣
=
+
=
﹣
=
+
=
+7=
=
﹣0.9=
﹣
=
+
=
﹣1=
+
+
=
+
=
﹣
=
+
=
﹣
= 6.4+2.3= 7.3﹣0.4=+=﹣=+=﹣= 6.4+2.3= 7.3﹣0.4=
= 12﹣12×0.1=
﹣
= 0.3+
= 1.66÷2=
+
= 7﹣
= 23+52=
﹣0.75= 50×25×1.2=
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