问题 解答题
125×23×1654×43+54×58-54
4.26×52.7﹢35.2×5.27﹢0.222×5272003-2002+2001-2000+…+5-4+3-2+1
1998×19991999-1999×19981998.
答案

(1)125×23×16,

=(125×8)×(23×2),

=1000×46,

=46000;

(2)54×43+54×58-54,

=54×(43+58-1),

=54×100,

=5400;

(3)4.26×52.7﹢35.2×5.27﹢0.222×527,

=4.26×52.7﹢3.52×52.7﹢2.22×52.7,

=(4.26+3.52+2.22)×52.7,

=10×52.7,

=527;

(4)2003-2002+2001-2000+…+5-4+3-2+1,

=(2003-2002)+(2001-2000)+…+(5-4)+(3-2)+1,

=1×1001+1

=1002;

(5)1998×19991999-1999×19981998,

=1998×1999×10001-1999×1998×10001,

=0.

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