图中长方形长6cm，宽4cm，已知阴影①比阴影②面积少3cm2，求EC的长．
直接写得数24÷= ﹣= 10+2.52= （﹣0.5）×=×= （+）×12= ×÷×= 0.32×200=
计算下面各题．= = = =+= = = ==
口算：= = = = == = =
看图填空．
（1）红色+绿色=+=（2）黄色+黑色=+=（3）红色﹣黄色=﹣=（4）你还能提出什么数学问题？能解答吗？
直接写出得数．========
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