题目内容
每题都要有必要的计算过程．
①23×2424-24×2323
②52.44×79.45+159×47.56+79.55×52.44
③18×
+0.65×
-
×18+
÷1
④2.75+
-1.4+2
÷
-87.5%
⑤
+
．
①23×2424-24×2323
②52.44×79.45+159×47.56+79.55×52.44
③18×
| 3 |
| 7 |
| 8 |
| 13 |
| 2 |
| 7 |
| 5 |
| 13 |
| 7 |
| 13 |
④2.75+
| 5 |
| 12 |
| 1 |
| 4 |
| 5 |
| 12 |
⑤
| 2010×2008+1 |
| 2009 |
| 2009+2010×2008 |
| 2009×2010-1 |
①23×2424-24×2323
=23×24×101-24×23×101
=0；
②52.44×79.45+159×47.56+79.55×52.44
=52.44×（79.45+79.55）+159×47.56
=52.44×159+159×47.56
=159×（52.44+47.56）
=159×100
=15900；
③18×
+0.65×
-
×18+
÷1
=
+
-
+
=（
-
）+（
+
）
=3
+
=3
；
④2.75+
-1.4+2
÷
-87.5%
=2.75+
-1.4+5.4-87.5%
=3
-1.4+5.4-87.5%
=3
+4-87.5%
=6
；
⑤
+
=
+
=
+
=2009+1
=2010．
=23×24×101-24×23×101
=0；
②52.44×79.45+159×47.56+79.55×52.44
=52.44×（79.45+79.55）+159×47.56
=52.44×159+159×47.56
=159×（52.44+47.56）
=159×100
=15900；
③18×
| 3 |
| 7 |
| 8 |
| 13 |
| 2 |
| 7 |
| 5 |
| 13 |
| 7 |
| 13 |
=
| 54 |
| 7 |
| 2 |
| 5 |
| 32 |
| 7 |
| 1 |
| 4 |
=（
| 54 |
| 7 |
| 32 |
| 7 |
| 2 |
| 5 |
| 1 |
| 4 |
=3
| 1 |
| 7 |
| 13 |
| 20 |
=3
| 111 |
| 140 |
④2.75+
| 5 |
| 12 |
| 1 |
| 4 |
| 5 |
| 12 |
=2.75+
| 5 |
| 12 |
=3
| 1 |
| 6 |
=3
| 1 |
| 6 |
=6
| 7 |
| 24 |
⑤
| 2010×2008+1 |
| 2009 |
| 2009+2010×2008 |
| 2009×2010-1 |
=
| 2009×2008+2008+1 |
| 2009 |
| 2009+2008×2009+2008 |
| 2009×(2009+1)-1 |
=
| 2009×(2008+1) |
| 2009 |
| 2009×(2008+1)+2008 |
| 2009×2009+2008 |
=2009+1
=2010．
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