如图是由大小两个正方形组成的，小正方形的边长是4厘米，求三角形ABC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：========
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= 0.2﹣
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+2÷9=
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= 1.55﹣
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= 1﹣
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