（1）画一个长方形，长和宽的比是3：2，周长是20厘米；（2）画一个三角形，底和高的比是3：2，面积是3平方厘米．（3）长方形和三角形的面积比是 （填写最简整数比）
计算下面各题×=×8= 6×= 27﹣= 22÷=×= 54÷=+= 1﹣=﹣= 16×=÷=
直接写得数． 3×= 1÷=÷=+= 0÷=×=÷= 6×=
×4=×=+=×=×=÷= 0÷=×= 0×10=×=+=﹣= 0÷=÷=×4= 3×1=+=﹣= 1÷（﹣）= 4÷×4=
直接写出得数．= 16×50%= 16÷==÷3== 4÷1%= 2+1÷= 7+= 1÷=
直接写出得数． 8×=÷=×÷×= 3.6×= 15π= 80×（1﹣60%）=
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×
=
×8= 6×
= 27﹣
= 22÷
=
×
=
=
+
= 1﹣
=
﹣
= 16×
=
÷
= 1÷
=
÷
=
+
=
=
×
=
= 6×
=
×4=
×
=
+
=
×
×
=
÷
= 0÷
×
= 0×10=
×
=
+
=
﹣
= 0÷
=
÷
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×4=
1=
=
﹣
= 1÷（
﹣
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×4=
= 16×50%= 16÷
=
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÷3=
= 4÷1%= 2+1÷
= 7+
= 1÷
=
=
÷
=
×
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×
= 15π= 80×（1﹣60%）=