题目内容
【题目】(中山市)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
③
④
⑤.
【答案】①0;②15900;③3;④6;⑤2010;
【解析】
试题分析:(1)化23×2424=23×24×101,24×2323=24×23×101即可解答
(2)运用乘法分配律解答,
(3)按照先算第二级运算,再算第一级运算的顺序解答,
(4)按照先算第二级运算,再从左到右顺序解答,
(5)运用乘法分配律化2010×2008=2009×2008+2008,2009+2010×2008=2009+2009×2008+2008=2009×2009,2009×2010﹣1=2009×2009+2009﹣1即可解答.
解答:解: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;
③
=+﹣+
=(﹣)+(+)
=2+
=3;
④
=2.75+﹣1.4+5.4﹣87.5%
=3﹣1.4+5.4﹣87.5%
=3+4﹣87.5%
=6;
⑤
=+
=+
=2009+1
=2010.
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