我对图形题一窍不通,

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我对图形题一窍不通,
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我对图形题一窍不通,
我对图形题一窍不通,
 

我对图形题一窍不通,
拿矩形面积减去凹进去的三角形面积

6.4×12-(12-5.5)×(6.4-1.8)/2=