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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.

题目详情
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.
▼优质解答
答案和解析
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.