问题 解答题
用简便方法计算.
2003×2003+2004×2004-2003×2004-2002×2003.62.4×4.8÷3.12÷8.
103.2+102.8+103.3+102.9+103.1+102.6.27.3÷36+2.05÷3.6+206÷360.
38.06×98-161.2×4.9.
答案

2003×2003+2004×2004-2003×2004-2002×2003,

=2003×2003-2002×2003+2004×2004-2003×2004,

=2003×(2003-2002)+2004×(2004-2003),

=2003+2004,

=4007;

103.2+102.8+103.3+102.9+103.1+102.6,

=103×6+(0.2-0.2+0.3-0.1+0.1-0.4),

=618-0.1,

=617.9;

38.06×98-161.2×4.9,

=38.06×98-8.06×98,

=(38.06-8.06)×98,

=30×98,

=2940;

62.4×4.8÷3.12÷8,

=62.4÷3.12×4.8÷8,

=20×0.6,

=12;

27.3÷36+2.05÷3.6+206÷360,

=27.3÷36+2.05÷3.6+206÷360

=273÷360+205÷360+206÷360

=(273+205+206)÷360

=684÷360

=1.9.

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