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

【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;

=++

=()+(+

=2+

=3

=2.75+﹣1.4+5.4﹣87.5%

=3﹣1.4+5.4﹣87.5%

=3+4﹣87.5%

=6

=+

=+

=2009+1

=2010.

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