在学校操场上（学校操场假设是长方形的），学生们用皮尺测量操场，皮尺不够长怎么办？
怎样简便怎样算．++=+++=﹣（+）=
．
﹣=+=+=﹣=﹣=﹣=+=﹣= 1﹣﹣=+=
+=﹣= 7.2÷0.3=﹣1=+0.2= 0.54÷9=﹣=﹣=﹣=+= 1÷0.25=+= 0.67+0.3= 0.38×2= 8.1÷0.09= 2﹣= 12×0.5= 2.5×0.6=
计算．（能简算的要简算）﹣（+）+（﹣）．
+
+
=
+
+
+
=
﹣（
+
）=
．
﹣
=
+
=
+
=
﹣
=
﹣
﹣
=
+
=
﹣
=
﹣
=
+
=
+
﹣
= 7.2÷0.3=
﹣1=
+0.2= 0.54÷9=
﹣
=
﹣
=
﹣
=
+
= 1÷0.25=
+
= 
= 12×0.5= 2.5×0.6=
﹣（
+
）
+（
﹣
）
．
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