求阴影部分的面积．
填一填．
直接写得数．+=﹣= 0.2﹣=+=﹣=+2÷9= 2﹣﹣= 1.55﹣= 1﹣﹣+= 0.5﹣﹣=
计算．===== 1﹣===
看图计算下面各题．+= +=
计算下列各题：========
+
=
﹣
= 0.2﹣
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﹣
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+2÷9=
﹣
= 1.55﹣
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=
=
=
=
=
= 1﹣
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=
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+
=
+
=
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