按要求做一做．①在右面的长方形中画一个最大的半圆．②画出这个组合图形的对称轴．③计算这个半圆的周长．
（1）3﹣1=（2）0.6÷=（3）75×10%= （4）+×4=（5）48×（﹣）=．
0.875+=== 1.25×0.16×8= 1÷0.5×2==
直接写出得数． 9.56+1.34== 1﹣== 1÷0.25%==== 1= 2.3÷0.3=
直接写得数．+=+= 2.4×0.5= 0.9÷0.03= 0.45×=÷=×= 0.4×0.12=
+= ÷5= +﹣+= 1.25×8= 0.15×1.2+3.8×15%= 2﹣÷= 0.25+0.75= +×0= （﹣）×= 4505÷5= 24.3﹣8.87﹣0.13= ．
=（2）0.6÷
=（3）75×10%=
+
×4=（5）48×（
﹣
）=．
=
=
=
=
= 1﹣
=
= 1÷0.25%=
=
=
= 1
= 2.3÷0.3=
+
=
+
= 2.4×0.5= 0.9÷0.03=
=
÷
=
×
= 0.4×0.12=
+
= 
÷5= 
﹣
+
÷
= 0.25+0.75= 
+
）×
= 4505÷5= 24.3﹣8.87﹣0.13= ．
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