7.05和7.0599保留一位小数都是7．l． ．
计算下面各题，能简算的要简算． ．
直接写得数﹣= ﹣= += 1﹣=+= ﹣=
用递等式计算.1﹣0.45+3 15﹣4+6 6+0.65++14﹣（3+8） 2﹣0.8+（0.25﹣）
= 7﹣2= 1+0.8= 1.2﹣=1.7﹣= 2.75+7= 8.25﹣= ﹣=
直接写出得数．= = == = == =
．
﹣
= 
﹣
+
= 1﹣
=
+
= 
﹣
=
﹣0.45+3
15﹣4
+6
6
+0.65+
+
+8
） 2
﹣0.8+（0.25﹣
）
= 7﹣2
= 1
+0.8= 1.2﹣
=
= 2.75+7
= 8.25﹣
= 
﹣
=
= 
= 
=
= 
= 
=
= 
=
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