计算下面各题，能简便的尽量简便．
（
+
﹣
）÷
[
﹣（
﹣
）]×
20.07×1994﹣19.93×2007
2.5×0.875+0.25×1.25 999
+99+9
+
2.5﹣
﹣
÷
．
相关试题
计算下面各题，能简便的尽量简便．
（+﹣）÷ [﹣（﹣）]× 20.07×1994﹣19.93×2007
2.5×0.875+0.25×1.25 999+99+9+ 2.5﹣﹣÷．
=
+0.37= 10﹣1
1﹣9.9%
：2
99099÷99
+
= 1
×
= 2
×8= 6
+
= 
5﹣1
﹣1.6= 2 
×0= 0
﹣
= 
÷
= 1
1.5+2.35= 3.85（
+
）×12= 14 ．
= 1.25×
= 24×（
﹣
）= 6.25+
=
﹣
= 9.7﹣3﹣1.7=（18+
）÷9= 1﹣
÷0.5=
÷2=
﹣
=
= 2
=
=
=
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