求图中阴影部分的面积和周长（单位：分米）．
直接写出得数． 21×= 1÷=÷= 8×=÷=+= 5﹣=×=
直接写出得数． ①×5= ②×= ③2﹣= ④2÷= ⑤÷1= ⑥0×= ⑦×= ⑧÷= ⑨÷21= ⑩+=
口算：×3= ，×2= ，×= ，×= ，÷4= ，÷= ，÷= ，÷= ．
直接写出得数． 15×=6= 0.52= 30：= 3.2+0.68= 6×÷6×=
直接写得数×15=×2=×=×=×= 1×=×=×34=×=×=×=×=÷10=÷= 0÷=÷4= 1÷= 22÷=÷=÷0.4=
= 1÷
=
÷
= 8×
=
÷
=
+
= 5﹣
=
×
=
×5= ②
×
= ③2﹣
= ④2÷
÷1=
= ⑦
×
= ⑧
÷
= ⑨
÷21= ⑩
+
=
×3= ，
×2= ，
×
= ，
×
= ，
÷4= ，
÷
= ，
÷
÷
= ．
=
6= 0.52=
= 3.2+0.68= 6×
÷6×
×15=
×2=
×
=
×
=
×
=
=
×
=
×34=
×
=
×
=
×
=
×
=
÷
= 0÷
=
÷4= 1÷
= 22÷
=
÷
÷0.4=
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